if the price of a tv is first decreased by 20 % and then increased by 40 % , then the net change in the price will be :
"explanation : solution : let the original price be rs . 100 . new final price = 140 % of ( 80 % of 100 ) = rs . 140 / 100 * 80 / 100 * 100 = rs . 112 . . ' . increase = 12 % answer : b"
subtract(divide(multiply(subtract(const_100, 20), add(const_100, 40)), const_100), const_100)