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A crate of fish cost a Kochi vendor ₹2400, but with the market slow he let it go for ₹1980. Find his loss percent.

Class 8Comparing QuantitiesComparing Quantities
  • A21.2%
  • B82.5%
  • C42%
  • D17.5%

Step-by-Step Solution

Loss = 2400 − 1980 = 420. Loss % is taken on the cost price: %. Trap: using the selling price as the base gives 21.2%, 82.5% is the fraction of the cost he recovered, and 42% misplaces the decimal point in 420.
Answer: D) 17.5%

Key idea: Discount

A discount is a reduction off the **marked price** (MP), not the cost price. The selling price (SP) is what the customer actually pays.

**SP = MP − Discount**
**Discount % = (Discount / MP) × 100**

Example: shirt MP ₹800, discount 25%. Discount amount = 25% of 800 = 200. SP = 800 − 200 = 600.

Note: discount % is calculated on MP. Profit/loss % (Class 7) is on CP. Don't mix them up.

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