If 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)

Answer: Option B

Solution

Answer: Option B

Solution:

$$\begin{array}{rl}& =\frac{28}{128}\times 100\\ & =21.875\%\\ & =21.88\%\end{array}$$