Question : The price of electricity has been increased by 25%. If a person wants to keep the expenditure the same, then the percentage reduction in the use of electricity should be:
Option 1: 19
Option 2: 18
Option 3: 21
Option 4: 20
Correct Answer: 20
Solution :
Let's assume the initial expenditure is 100.
Expenditure after a price increase of 25% = 125
The consumption should be decreased in such a way that expenditure remains the same.
Required Percentage to decrease consumption = $\frac{25}{125}$ × 100 = 20%
Hence, the correct answer is 20.
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