Rates are not added together in double discounts. First, a 50% discount is applied, then a 20% discount is applied to the remaining amount. The total discount is 60%, not 70%.

Multiply the original price by the discount percentage and divide by 100 to find the discount amount. Subtract this amount from the original price to get the discounted price.

The maximum discount rate is 100%, which means the product is free of charge.