when the price of a radio was reduced by 20 % , its sale increased by 80 % . what was the net effect on the sale ?
let the original price be x and sale be of y units . then , the revenue collected initially = x × y now , new price = 0.8 x , new sale = 1.8 y then , new revenue collected = 1.44 xy % increase in revenue = 0.44 xy / xy × 100 = 44 % increase answer a
add(add(20, 20), divide(multiply(20, 20), const_100))