boy sells a book for rs . 800 he gets a loss of 20 % , to gain 10 % , what should be the sp ?
cost price = 800 / 80 x 100 = 1000 to gain 10 % = 1000 x 10 / 100 = 100 sp = cp + gain = 1000 + 100 = 1100 answer : a
add(divide(800, subtract(const_1, divide(20, const_100))), multiply(divide(800, subtract(const_1, divide(20, const_100))), divide(10, const_100)))