The price of petrol is increased by 25%. By how much percent a car owner should reduce his consumption of petrol so, that expenditure on petrol would not increase?
- 35%
- 20%
- 25%
- None of these
Explanation
Price ↑ 25% → Multiply consumption by (1 - x/100) to keep expenditure same.
Solve: 1.25 × (100 - x) = 100 → x = 20%.
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