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    Question

    The price of petrol rises by 60%. By what percent age

    should one minimise the use of petrol so that the expenditure towards petrol is not affected?
    A 38.5 Correct Answer Incorrect Answer
    B 36.5 Correct Answer Incorrect Answer
    C 37.5 Correct Answer Incorrect Answer
    D 35.5 Correct Answer Incorrect Answer

    Solution

    Let the price of petrol be Rs. 100 If 60% is increased in price = (100 + 60) = Rs. 160 Thus, the reduced consumption for the price to be constant will be, [(100/100) - (100/160)] × 100 ⇒ [1 - (100/ 60)] × 100 ⇒ [(160 - 100)/160] × 100 ⇒ (60/160) × 100 ⇒ (3/8) × 100 ⇒ 0.375 × 100 ⇒ 37.5 %

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