The price of petrol increased by 25%. By what percentage must a driver reduce consumption to keep expenditure constant?

Topic: Arithmetic &amp; Percentages
Subtopic: Percentage Adjustments

A15%

B20%

C25%

D30%

Explanation

Reduction percentage = [r / (100 + r)] * 100 = [25 / (100 + 25)] * 100 = (25 / 125) * 100 = 20%.

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