If the price of petrol increases by 25%, by what percentage must a motorist reduce consumption so that expenditure remains constant?
A15%
B20%
C25%
D30%
Explanation
% Reduction = [r / (100 + r)] * 100 = [25 / 125] * 100 = (1 / 5) * 100 = 20%.
Exam Relevance
- Topic: Percentages
- Subtopic: Consumption & Price
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