By what per cent the use of fuel is to be reduced in order to keep expenditure on it at same level when its price is increased by25% ?

By what per cent the use of fuel is to be reduced in order to keep expenditure on it at same level when its price is increased by25% ? Correct Answer 20

Reduction % in consumption = (100 + rr​×100)% = (12525​×100) = 20%
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