If the price of petrol increases by 32, by how much must a user cut down his consumption so that his expenditure on petrol remains constant? Select:
A) 25%
B) 20%
C) 24.2%
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+32) i.e 132.   Now, his consumption should be reduced to :-   =(132−100)/132 ∗ 100.   Hence, the consumption should be reduced to 24.2%.   Answer : 24.2%
<result>C</result>
If the price of petrol increases by 32, by how much must a user cut down his consumption so that his expenditure on petrol remains constant?