by selling 18 pencils for a rupee a man loses 10 % . how many for a rupee should he sell in order to gain 35 % ?
90 % - - - 18 135 % - - - ? 90 / 135 * 18 = 12 answer : e
multiply(divide(const_1, multiply(add(const_100, 35), divide(const_1, subtract(const_100, 10)))), 18)