If the price of petrol increases by 30, by how much must a user cut down his consumption so that his expenditure on petrol remains constant? Select the correct option
A) 25%
B) 23%
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+30) i.e 130.   Now, his consumption should be reduced to :-   =(130−100)/130 ∗ 100.   Hence, the consumption should be reduced to 23%.   Answer : 23%
<result>B</result>
If the price of petrol increases by 30, by how much must a user cut down his consumption so that his expenditure on petrol remains constant?