on increasing the price of t . v . sets by 80 % , their sale decreases by 20 % . what is the effect on the revenue receipts of the shop ?
"explanation : let the price be = rs . 100 , and number of units sold = 100 then , sale value = rs . ( 100 × 100 ) = rs . 10000 new sale value = rs . ( 180 × 80 ) = rs . 14400 increase % = 4400 / 10000 × 100 = 44 % answer : a"
subtract(add(const_100, 80), add(divide(multiply(add(const_100, 80), 20), const_100), const_100))