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)
A. 12.35%
B. 21.88%
C. 20.25%
D. 25.75%
Answer: Option B
Solution (By Examveda Team)

$$\eqalign{ & = \frac{{28}}{{128}} \times 100 \cr & = 21.875\% \cr & = 21.88\% \cr} $$

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