if a man lost 8 % by selling oranges at the rate of 18 a rupee at how many a rupee must he sell them to gain 45 % ?
"92 % - - - - 18 145 % - - - - ? 92 / 145 * 18 = 11.42 answer : c"
divide(multiply(subtract(const_100, 8), 18), add(const_100, 45))