4024/12 May/Jun 2025, Question 13: Percentage Increases and Decreases
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 4 marks
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The question, in short
Sale reduces all prices by 20%. Find the sale price of an $85 coat, and find the original cost of a shirt whose sale price is $40.
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Part (a) · 2 marks
Work out the sale price of a coat originally costing $85 after a 20% reduction.
- 120% of 85 = 17
- 285 − 17 = $68
Answer68
Part (b) · 2 marks
Work out the pre-sale cost of a shirt whose sale price is $40 after a 20% reduction.
- 180% of original = 40
- 2Original = 40 ÷ 0.8 = $50
Answer50
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