Problem: the wages earned by robin is 40 % more than that earned by erica . the wages earned by charles is 60 % more than that earned by erica . how much percent is the wages earned by charles more than that earned by robin ?
Rationale: "let wage of erica = 10 wage of robin = 1.4 * 10 = 14 wage of charles = 1.6 * 10 = 16 percentage by which wage earned by charles is more than that earned by robin = ( 16 - 14 ) / 14 * 100 % = 2 / 14 * 100 % = 14 % answer a"
annotated_formula: multiply(divide(subtract(add(const_100, 60), add(const_100, 40)), add(const_100, 40)), const_100)