If the price of petrol increases by 20, by how much must a user cut down his consumption so that his expenditure on petrol remains constant?  Pick one:	A) 16.7%	B) 20%	C) 24.67%	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+20) i.e 120.   Now, his consumption should be reduced to :-   =(120−100)/120 ∗ 100.   Hence, the consumption should be reduced to 16.7%.   16.7%nswer : 16.7%
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If the price of petrol increases by 20, by how much must a user cut down his consumption so that his expenditure on petrol remains constant?