if a man lost 10 % by selling oranges at the rate of 12 a rupee at how many a rupee must he sell them to gain 44 % ?
90 % - - - - 12 144 % - - - - ? 90 / 144 * 12 = 7.50 answer : b
divide(multiply(subtract(const_100, 10), 12), add(const_100, 44))