if the price of a book is first decreased by 20 % and then increased by 20 % , then the net change in the price will be :
"explanation : let the original price be rs . 100 . decreased by 20 % = 80 then increased 20 % on rs 80 = 80 + 16 = 96 net change in price = 100 - 96 = 4 answer : c"
subtract(const_100, multiply(multiply(divide(subtract(const_100, divide(multiply(const_100, 20), const_100)), const_100), divide(add(const_100, divide(multiply(const_100, 20), const_100)), const_100)), const_100))