Question 120

The price of petrol was raised by 15%. By how much percentage should a motorist reduce the consumption of petrol so that the expenditure on it does not increase?

Solution

Let ,the initial price of petrol was

$$=100.$$

After increase,price of petrol

$$=100+100×15/100=115.$$

so,reduction in consumption would be

$$=((115-100)/115)×100$$

$$=(15/115)×100.$$

$$=300/23$$

So,Option C is correct.

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