In a town, the price of petrol increased by 25%. By what percentage should Ramesh reduce his petrol consumption so that his total spending on petrol remains unchanged?

Question

Accepted Answer

20%. New factor must satisfy 1.25 x (1 - r) = 1, so 1 - r = 0.8, r = 0.2 = 20% reduction.

In a town, the price of petrol increased by 25%. By what percentage should Ramesh reduce his petrol consumption so that his total spending on petrol remains unchanged?

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