if price of t . v set is reduced by 18 % , then its sale increases by 72 % , find net effect on sale value
"- a + b + ( ( - a ) ( b ) / 100 ) = - 18 + 72 + ( - 18 * 72 ) / 100 = - 18 + 72 - 13 = 41 answer : a"
multiply(subtract(multiply(divide(subtract(const_100, 18), const_100), divide(add(const_100, 72), const_100)), const_1), const_100)