Problem: a person saved $ 50 in buying an item on sale . if he spent $ 500 for the item , approximately how much percent he saved in the transaction ?
Rationale: "actual price = 500 + 50 = $ 550 saving = 10 / 550 * 100 = 100 / 55 = 1.8 % approximately answer is e"
annotated_formula: add(floor(multiply(divide(50, add(50, 500)), 500)), const_1)