If the price of gasoline increases by 25% and a driver intends to spend only 10% more on gasoline, by how much percent should the driver reduce the quantity of gasoline that he buys? Choose the correct option:
A) 5%	B) 8%	C) 10%	D) 12%	E) 15%
Let x be the amount of gasoline the driver buys originally.   Let y be the new amount of gasoline the driver should buy.   Let P be the original price per liter.   (1.25*P)y = 1.1(P*x)   y = (1.1/1.25)*x = 0.88x which is a reduction of 12%.   The answer is 12%.
<result>D</result>
If the price of gasoline increases by 25% and a driver intends to spend only 10% more on gasoline, by how much percent should the driver reduce the quantity of gasoline that he buys?