The price of petrol is increased by 25%. By how much percent should a car owner reduce his consumption of petrol so that the expenditure on petrol would not increase ?

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Solution

Reduction $%$ in consumption $= (\frac{r}{100 + r} \times 100)$ %

$= (\frac{25}{125} \times 100) = 20$ %

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The price of petrol is increased by 25%. By how much percent should a car owner reduce his consumption of petrol so that the expenditure on petrol would not increase ?

Reduction % in consumption =(r100+r×100)%=(25125×100)=20%

Reduction $%$ in consumption $= (\frac{r}{100 + r} \times 100)$ %

$= (\frac{25}{125} \times 100) = 20$ %