We usually hear all kinds of discounts when selling vegetables and clothes, among which 20% discount is 20% discount, that is, 20% discount on the original price. The original price of a thing 100 is now 20% off. The algorithm is100x80 =100x0.8 = 80.
3. So the discount formula is that the original selling price times the discount rate equals the discount price. The above is a clever calculation method of several discounts in grade three.