if the price of a book is first decreased by 50 % and then increased by 60 % , then the net change in the price will be ?
"let the original price be $ 100 new final price = 160 % of ( 50 % of $ 100 ) = 160 / 100 * 50 / 100 * 100 = $ 80 decrease is 20 % answer is a"
subtract(const_100, multiply(multiply(divide(subtract(const_100, divide(multiply(const_100, 50), const_100)), const_100), divide(add(const_100, divide(multiply(const_100, 60), const_100)), const_100)), const_100))