If the price of petrol increases by 25, by how much must a user cut down his consumption so that his expenditure on petrol remains constant? Pick one
A) 25%	B) 20%	C) 16.67%	D) 33.33%	E) None of these
Explanation :   let us assume before increase the petrol will be Rs. 100.   After increase it will be Rs (100+25) i.e 125.   Now, his consumption should be reduced to :-   =125−100125∗100.   Hence, the consumption should be reduced to 20%.   Answer : 20%
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If the price of petrol increases by 25, by how much must a user cut down his consumption so that his expenditure on petrol remains constant?