278 lines
11 KiB
Markdown
278 lines
11 KiB
Markdown
# 🎯 Dynamic Chit Fund Calculator - Complete Guide
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## ✨ **NEW! Adjustable Chit Fund Calculations**
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---
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## 🎉 **What You Get**
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A **fully customizable calculator** that lets you:
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- ✅ Adjust how much lifters get each month (via sliders!)
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- ✅ See calculations update in real-time
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- ✅ Choose different progression modes (Linear, Accelerated, Custom)
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- ✅ Use presets (Conservative, Balanced, Aggressive, Your Sample)
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- ✅ View complete month-by-month table with ALL columns
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- ✅ See dividend calculations automatically
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- ✅ **Matches your sample data EXACTLY when using "Your Sample" preset!**
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---
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## 📊 **Complete Table (Like Your Sample)**
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```
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┌────────┬──────────┬────────────┬──────┬─────┬────────┬──────────┐
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│ Month │ Chit │ Lifter │ Sub. │ Fee │ Total │ Dividend │
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│ │ Value │ Gets │ │ │Payment │ │
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├────────┼──────────┼────────────┼──────┼─────┼────────┼──────────┤
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│ 1 │ ₹2,00,000│ ₹1,75,300 │₹10,000│₹250│₹10,250│+₹24,700 │
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│ Mar-25 │ │ │ │ │ │ │
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├────────┼──────────┼────────────┼──────┼─────┼────────┼──────────┤
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│ 2 │ ₹2,00,000│ ₹1,77,900 │₹10,000│₹250│₹10,250│+₹22,100 │
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│ Apr-25 │ │ │ │ │ │ │
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├────────┼──────────┼────────────┼──────┼─────┼────────┼──────────┤
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│ ... │ ... │ ... │ ... │ ... │ ... │ ... │
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├────────┼──────────┼────────────┼──────┼─────┼────────┼──────────┤
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│ 16 │ ₹2,00,000│ ₹2,14,100 │₹10,000│₹250│₹10,250│-₹14,100 │
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│ Jun-26 │ │ │ │ │ │ │
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├────────┼──────────┼────────────┼──────┼─────┼────────┼──────────┤
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│ 20 │ ₹2,00,000│ ₹2,24,700 │₹10,000│₹250│₹10,250│-₹24,700 │
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│ Oct-26 │ │ │ │ │ │ │
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└────────┴──────────┴────────────┴──────┴─────┴────────┴──────────┘
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```
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**ALL 7 COLUMNS from your sample!** ✅
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---
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## 🎚️ **Interactive Controls**
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### **1. Adjustable Sliders**
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```
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┌────────────────────────────────────────────────┐
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│ 🎛️ Adjust Lift Amount Calculations │
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├────────────────────────────────────────────────┤
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│ │
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│ First Month Lifter Gets: │
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│ ━━━━━━━●━━━━━━━━━━━━━━━━ 87.7% = ₹1,75,300 │
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│ 70% 95% │
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│ │
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│ Last Month Lifter Gets: │
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│ ━━━━━━━━━━━━━━━━━●━━━━━ 112.4% = ₹2,24,700 │
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│ 95% 120% │
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│ │
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│ Progression Mode: │
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│ [Linear] [Accelerated] [Custom] │
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│ │
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│ Quick Presets: │
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│ [Conservative] [Balanced] [Aggressive] │
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│ [Your Sample] ← Matches your exact data! │
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└────────────────────────────────────────────────┘
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```
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**Drag sliders → Table updates instantly!** ⚡
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---
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## 🧮 **Calculation Modes**
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### **1. Linear (Default)**
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```
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Increment per month = (End% - Start%) / (Months - 1)
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Example:
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Start: 87.65%
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End: 112.35%
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Duration: 20 months
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Increment = (112.35% - 87.65%) / 19 = 1.3% per month
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Month 1: 87.65% × ₹2,00,000 = ₹1,75,300
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Month 2: 88.95% × ₹2,00,000 = ₹1,77,900
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Month 20: 112.35% × ₹2,00,000 = ₹2,24,700
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```
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### **2. Accelerated**
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```
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Growth speeds up in later months (quadratic)
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Early months: Slower increase
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Late months: Faster increase
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Good for: Rewarding patient members more
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```
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### **3. Custom**
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```
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Add your own formula
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Define specific percentages
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Fine-tune for specific business rules
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```
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---
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## 🎯 **Preset Options**
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### **1. Conservative**
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```
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Start: 90.0% (₹1,80,000)
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End: 100.0% (₹2,00,000)
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Mode: Linear
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Use for: Low-risk groups, new members
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Benefit: Smaller variation, less confusion
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```
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### **2. Balanced**
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```
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Start: 85.0% (₹1,70,000)
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End: 105.0% (₹2,10,000)
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Mode: Linear
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Use for: Standard chit funds
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Benefit: Fair balance, traditional approach
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```
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### **3. Aggressive**
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```
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Start: 80.0% (₹1,60,000)
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End: 115.0% (₹2,30,000)
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Mode: Accelerated
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Use for: High-value chits, experienced members
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Benefit: Maximum incentive for waiting
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```
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### **4. Your Sample** ⭐
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```
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Start: 87.65% (₹1,75,300)
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End: 112.35% (₹2,24,700)
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Mode: Linear
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Matches your exact sample data!
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Click this to replicate your table exactly!
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```
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---
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## 💰 **Understanding the Mathematics**
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### **Why Last Month Lifter Gets MORE than Chit Value?**
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**Example from your sample:**
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```
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Chit Value: ₹2,00,000
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Month 20 Lifter Gets: ₹2,24,700 (112.35%)
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Extra: ₹24,700
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Why this makes sense:
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```
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**Member's Journey:**
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```
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Month 1: Pay ₹10,250, receive dividend +₹24,700 = Net -₹10,250 + ₹24,700
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Month 2: Pay ₹10,250, receive dividend +₹22,100 = Net similar
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... (receives dividends each month from early lifters' discounts)
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Month 20: Pay ₹10,250, receive ₹2,24,700
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Total Paid: ₹10,250 × 20 = ₹2,05,000
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Total Got: ₹2,24,700 + all monthly dividends
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Net Gain: Significant positive!
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```
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**It's like earning compound interest!** 📈
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---
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## 📊 **Dividend Calculation**
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### **Dividend = Chit Value - Lift Amount**
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**Month 1:**
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```
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Chit Value: ₹2,00,000
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Lifter Gets: ₹1,75,300
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Dividend: ₹2,00,000 - ₹1,75,300 = +₹24,700
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This ₹24,700 is distributed among non-lifters!
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Per member (19 others): ₹24,700 ÷ 19 = ₹1,300 each
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Each non-lifter's net payment:
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₹10,250 - ₹1,300 = ₹8,950 (saved ₹1,300!)
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```
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**Month 20:**
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```
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Chit Value: ₹2,00,000
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Lifter Gets: ₹2,24,700
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Dividend: ₹2,00,000 - ₹2,24,700 = -₹24,700
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Negative dividend means members PAY EXTRA!
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Per member (19 others): -₹24,700 ÷ 19 = -₹1,300 each
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Each non-lifter's net payment:
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₹10,250 + ₹1,300 = ₹11,550 (pay extra ₹1,300)
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```
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**But they already received dividends in early months, so it balances out!**
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---
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## 🎨 **User Interface**
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### **Step 3: Review & Schedule**
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```
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┌─────────────────────────────────────────────┐
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│ ✅ Group Summary │
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│ • Name: Family Chit Fund │
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│ • Chit Value: ₹2,00,000 │
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│ • Duration: 20 months │
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│ • Monthly Payment: ₹10,250 │
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└─────────────────────────────────────────────┘
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┌─────────────────────────────────────────────┐
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│ 🎛️ Adjust Lift Amount Calculations [▼] │ ← Click to expand
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├─────────────────────────────────────────────┤
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│ First Month Lifter Gets: │
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│ ━━━━━━━●━━━━━━━━━━ 87.7% = ₹1,75,300 │ ← Drag to adjust
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│ │
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│ Last Month Lifter Gets: │
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│ ━━━━━━━━━━━━━━━●━━━ 112.4% = ₹2,24,700 │ ← Drag to adjust
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│ │
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│ Mode: [Linear] [Accelerated] [Custom] │
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│ │
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│ Presets: [Conservative] [Balanced] │
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│ [Aggressive] [Your Sample] │
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└─────────────────────────────────────────────┘
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┌─────────────────────────────────────────────┐
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│ Month-wise Payment Schedule │
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├───┬───────┬───────┬─────┬────┬──────┬──────┤
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│ M │ Chit │Lifter │ Sub │Fee │Total │ Div. │
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├───┼───────┼───────┼─────┼────┼──────┼──────┤
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│ 1 │200000 │175300 │10000│250 │10250 │+24700│ 🟢
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│Mar│ │ │ │ │ │ │
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├───┼───────┼───────┼─────┼────┼──────┼──────┤
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│ 2 │200000 │177900 │10000│250 │10250 │+22100│ 🟢
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│Apr│ │ │ │ │ │ │
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├───┼───────┼───────┼─────┼────┼──────┼──────┤
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│...│ ... │ ... │ ... │... │ ... │ ... │
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├───┼───────┼───────┼─────┼────┼──────┼──────┤
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│20 │200000 │224700 │10000│250 │10250 │-24700│ 🟣
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│Oct│ │ │ │ │ │ │
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└───┴───────┴───────┴─────┴────┴──────┴──────┘
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📊 Financial Analysis
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┌──────────────────┬───────────────────────┐
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│ First Month │ Last Month │
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│ Lifter: ₹1,75,300│ Lifter: ₹2,24,700 │
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│ Dividend: +₹24,700│ Dividend: -₹24,700 │
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└──────────────────┴───────────────────────┘
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Summary:
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• Total per Member: ₹2,05,000
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• Lift Range: ₹1,75,300 → ₹2,24,700
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• Monthly Increment: ₹2,600
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