During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 10 gallons. If Kim purchased 15 gallons of gas, and Isabella purchased 25 gallons of gas, then Isabella‟s total per-gallon discount is what percent of Kim‟s total per-gallon discount? Choose the correct choice:
A) 80%
B) 100%
C) 116.7%
D) 120%
E) 180%
Kim purchased 15 gallons of gas. She paid for   10 + 0.9*5= 
<gadget id="calculator">  10 + 0.9*5</gadget>
<output>14.5</output>
14.5 gallons, so the overall discount she got was 0.5/15= 3.33%.   Isabella purchased 25 gallons of gas. She paid for   10 + 0.9*15= 
<gadget id="calculator">  10 + 0.9*15</gadget>
<output>23.5</output>
23.5 gallons, so the overall discount she got was 1.5/25= 6%.   6 is 6/3.33*100 = 180% of 3.33.   Answer: 180%.
<result>E</result>
During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 10 gallons. If Kim purchased 15 gallons of gas, and Isabella purchased 25 gallons of gas, then Isabella‟s total per-gallon discount is what percent of Kim‟s total per-gallon discount?