if the cost price is 90 % of the selling price , then what is the profit percent ?
"let s . p . = $ 100 c . p . = $ 90 profit = $ 10 profit % = 10 / 90 * 100 = 25 / 6 = 11 % approximately answer is b"
multiply(divide(subtract(const_100, 90), 90), const_100)