by selling an article for $ 110 , a person gains $ 10 . what is the gain % ?
"s . p . = $ 110 gain = $ 10 c . p . = 110 - 10 = 100 gain % = 10 / 100 * 100 % = 10 % answer is e"
divide(multiply(10, const_100), subtract(110, 10))