Problem: by selling 10 pencils for a rupee a man loses 25 % . how many for a rupee should he sell in order to gain 25 % ?
Rationale: "75 % - - - 10 125 % - - - ? 75 / 125 * 10 = 6 answer : a"
annotated_formula: multiply(divide(const_1, multiply(add(const_100, 25), divide(const_1, subtract(const_100, 25)))), 10)