During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 5 gallons. If Kim purchased 20 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 option
A) 80%
B) 107%
C) 116.7%
D) 120%
E) 140%
Kim purchased 20 gallons of gas. She paid for   5 + 0.9*15= 
<gadget id="calculator">  5 + 0.9*15</gadget>
<output>18.5</output>
18.5 gallons, so the overall discount she got was 1.5/20= 7.5%.   Isabella purchased 25 gallons of gas. She paid for   5 + 0.9*20= 
<gadget id="calculator">  5 + 0.9*20</gadget>
<output>23</output>
23 gallons, so the overall discount she got was .5/25= 8%.   8 is 8/7.5*100 = 107% of 7.5.   Answer: 107%.
<result>B</result>
During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 5 gallons. If Kim purchased 20 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?