The price of petrol is increased by 28%. By what percentage should the consumption be decreased by the consumer, if the expenditure on petrol remains unchanged?

(Correct to 2 decimal places)

21.88%

The price of petrol is increased by 28%

Price is inversely Propotional to Expenditure .

                   Original   :   New 

Price               100      :      128

Expenditure     128      :      100

Required Percentage = \(\frac{128-100}{128}\) × 100 = 21.875%

= 21.88%