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The price of cooking oil has increased by 25 % . The percentage of reduction that a family should…

To keep spending the same, the quantity must fall to \( \tfrac{1}{1.25} = 0.8 \) of what it was, a cut of 20 per cent. Cutting use by 25 per cent is the tempting wrong…

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The price of cooking oil has increased by 25 % . The percentage of reduction that a family should effect in the use of cooking oil so not to increase the expenditure on this account is

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Correct answer C

To keep spending the same, the quantity must fall to 11.25=0.8 \tfrac{1}{1.25} = 0.8 of what it was, a cut of 20 per cent.

Cutting use by 25 per cent is the tempting wrong answer, but it would reduce spending, because the 25 per cent rise is on the old price.

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