1. Original price × (discount ÷ 10) For example, the original price of 70 yuan is 70×(3÷ 10)=2 1. For example, 20% discount means: original price × 20% discount.

2. Original price × discount/10. For example, 50% off the original price in 40 yuan is 40×5/ 10=20.

3. Original price ×0. The discount is as follows: the original price 100 yuan, with a discount, namely:100× 0.1=10.