| 40. | If the price of petrol increases by 25% and Raj intends to spend only an additional 15% on petrol, by how much % will he reduce the quantity of petrol purchased? |
| A. | 10% |
| B. | 12% |
| C. | 8% |
| D. | 6.67% |
Answer - (C) Solution: Let the price of 1 litre of petrol be Rs.x and let Raj initially buys 'y' litres of petrol.
Therefore, he would have spent Rs. xy on petrol.
When the price of petrol increases by 25%, the new price per litre of petrol is 1.25x.
Raj intends to increase the amount he spends on petrol by 15%.
i.e., he is willing to spend xy + 15% of xy = 1.15xy
Let the new quantity of petrol that he can get be 'q'.
Then, 1.25x * q = 1.15xy
=> q=(1.15xy1.25x)=(1.15y1.25)=0.92y
As the new quantity that he can buy is 0.92y, he gets 0.08y lesser than what he used to get earlier.
Or a reduction of 8%.
Title : Percentage Q40
Description : 40. If the price of petrol increases by 25% and Raj intends to spend only an additional 15% on petrol, by how much % will he re...
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