The price (per litre) of petrol increases by 85%. By what percent should its consumption be reduced such that the expenditure on it increases by 48% only?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 20%.
Price increase by 85% ,so becomes 185%
We want expenditure increase by only 48% , so becomes 148%
% Reduction in Consumption
= (Desired Expenditure % ÷ New Price %) × 100
= (148 ÷ 185) × 100
= 80%
So, consumption becomes 80%, i.e., reduction is 100% - 80% = 20%