a merchant has selected two items to be placed on sale , one of which currently sells for 25 percent less than the other . if he wishes to raise the price of the cheaper item so that the two items are equally priced , by what percentage must he raise the price of the less expensive item ?
"expensive item = $ 100 ; cheap item = $ 75 ; we must increase $ 75 to $ 100 , so by $ 25 , which is approximately 30 % increase : ( 100 - 75 ) / 75 = 1 / 3 = ~ 0.33 answer : c ."
multiply(divide(divide(25, const_100), subtract(const_1, divide(25, const_100))), const_100)