If the price of gasoline increases by 25% and a driver intends to spend only 5% more on gasoline, by how much percent should the driver reduce the quantity of gasoline that he buys? Answers:
A) 20%
B) 16%
C) 15%
D) 12%
E) 10%
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 = 1.05(P*x)   y = (1.05/1.25)= 
<gadget id="calculator">(1.05/1.25)</gadget>
<output>0.84</output>
0.84x which is a reduction of 16%.   The answer is 16%.
<result>B</result>
If the price of gasoline increases by 25% and a driver intends to spend only 5% more on gasoline, by how much percent should the driver reduce the quantity of gasoline that he buys?