Class 4 Math: The Junk Seller Quick Revision Chapter Summary

Need to review the entire chapter before a test? This quick revision guide summarizes all the core concepts, topics, and equations taught in Class 4 The Junk Seller to help you refresh your memory instantly.

Core Topics At a Glance

### 📌 Loan and Interest basics Understanding simple loans where a sum is borrowed and paid back over time in monthly instalments, sometimes including a small extra charge called interest.

### 📌 Preparing billing sheets Creating clear tables listing items, quantities, unit prices, subtotals, and the final grand total for shopping purchases.

### 📌 Profit and Loss calculation Calculating if money was made (profit) or lost (loss) based on the difference between Cost Price (CP) and Selling Price (SP).

### 📌 Rate list multiplication Using a fixed rate price chart to calculate total costs for different quantities of multiple items.

Key Formulas Mind Map

• Profit Formula: `Profit = Selling\ Price - Cost\ Price` - Net margin when selling price exceeds cost....
• Loss Formula: `Loss = Cost\ Price - Selling\ Price` - Negative margin when cost exceeds selling price....

Revision Checklist

1. Review the subtopic guides and outline notes.
2. Practice writing the key formulas from memory.
3. Solve at least 3 worked examples and check your steps.
4. Take a timed practice quiz to verify your speed.