if a man lost 8 % by selling oranges at the rate of 25 a rupee at how many a rupee must he sell them to gain 25 % ?
"92 % - - - - 25 125 % - - - - ? 92 / 125 * 25 = 18.4 answer : c"
divide(multiply(subtract(const_100, 8), 25), add(const_100, 25))