4024/13 May/Jun 2025, Question 15: Calculating a Percentage of a Quantity

Cambridge O Level Mathematics 4024 · Paper 13 (Non-calculator) · Non-calculator · 5 marks

The question, in short

Three percentage questions: find 70% of 120, express 8 out of 25 as a percentage, and work back from a sale price of $66 after a 12% reduction to the original jacket price.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 2 marks

Calculate 70% of 120.

170/100 × 120
2= 0.7 × 120 = 84

Answer84

Part (b) · 1 mark

Express 8 as a percentage of 25.

18/25 × 100 = 32%

Answer32

Part (c) · 2 marks

A jacket's price is cut by 12% to a sale price of $66; calculate the original price.

1Sale price = (100 − 12)% = 88% of original
20.88 × x = 66
3x = 66 ÷ 0.88 = $75

Answer75

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