During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 15 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 choice from the following answers:
A) 80%
B) 100%
C) 116.7%
D) 120%
E) 160%
Kim purchased 20 gallons of gas. She paid for   15 + 0.9*5= 
<gadget id="calculator">  15 + 0.9*5</gadget>
<output>19.5</output>
19.5 gallons, so the overall discount she got was 0.5/20= 0.025.   Isabella purchased 25 gallons of gas. She paid for   15 + 0.9*10= 
<gadget id="calculator">  15 + 0.9*10</gadget>
<output>24</output>
24 gallons, so the overall discount she got was 1/25= 0.04.   4/2.5*100= 
<gadget id="calculator">4/2.5*100</gadget>
<output>160</output>
160%   Answer: 160%.
<result>E</result>
During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 15 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?