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 ?
"kim purchased 20 gallons of gas . she paid for 15 + 0.9 * 5 = 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 = 24 gallons , so the overall discount she got was 1 / 25 = 0.04 . 4 / 2.5 * 100 = 160 % answer : e ."
multiply(divide(multiply(subtract(const_1, divide(add(divide(multiply(add(10, subtract(10, const_1)), subtract(const_100, 10)), const_100), 15), 25)), const_100), multiply(subtract(const_1, divide(add(15, divide(multiply(add(10, const_4), subtract(const_100, 10)), const_100)), 20)), const_100)), const_100)