Arithmetic

Percentages

Easy

The price of cooking gas has increased by 25 %. By what percent should a family reduce the use of cooking gas so as not to increase the expenditure in this account ?

10%

20%

30%

25%

✅ Correct Option: 2

Let original price be 100 and consumption be 1. Expenditure $= 100$ . New price $= 125$ . To keep expenditure same, new consumption $= \frac{100}{125} = 0.8$ . Reduction $= 1 - 0.8 = 0.2 = 20\%$ .

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The price of cooking gas has increased by 25 %. By what percent should a family reduce the use of cooking gas so as not to increase the expenditure in this account ?

Solution

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