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?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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