If the price of gasoline increases by 25% and Ron intends to spend only 15% more on gasoline, by how much % should he reduce the quantity of gasoline that he buys? Choose the correct choice from the following answers:	A) 10%	B) 12.5%	C) 8%	D) 12%	E) 6.66%
Explanatory Answer   Let the price of 1 litre of gasoline be $x and let Ron initially buy 'y' litres of gasoline.   Therefore, he would have spent $xy on gasoline.   When the price of gasoline increases by 25%, the new price per litre of gasoline is 1.25x.   Ron intends to increase the amount he spends on gasoline by 15%.   i.e., he is willing to spend xy + 15% of xy = 1.15xy   Let the new quantity of gasoline that he can get be 'q'.   Then, 1.25x * q = 1.15xy   Or q = 1.15xy/1.25x = 0.92y.   As the new quantity that he can buy is 0.92y, he gets 0.08y lesser than what he used to get earlier.   Or a reduction of 8%.   The correct choice is (8%)1.15  /1.25= 
<gadget id="calculator">1.15  /1.25</gadget>
<output>0.92</output>
0.92y.   As the new quantity that he can buy is 0.92y, he gets 0.08y lesser than what he used to get earlier.   Or a reduction of 8%.   The correct choice is (8%)
<result>C</result>
If the price of gasoline increases by 25% and Ron intends to spend only 15% more on gasoline, by how much % should he reduce the quantity of gasoline that he buys?