when the price of an article is reduced by 30 % , the sales increases by 50 % . the percentage change in the total amount of receipts is ?
we have , receipts = price x sales therefore , net % change in receipts = ( x + y + xy / 100 ) % = [ - 30 + 50 + ( - 30 x 50 ) / 100 ] % = 5 % increase . answer : b
subtract(divide(multiply(subtract(const_100, 30), add(const_100, 50)), const_100), const_100)