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?  Choose the correct choice from the following choices
A) 25 %	B) 23 %	C) 16.67 %	D) 33.33 %	E) none of these

Rationale: "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 : b"
Answer: B