How to calculate the paid amount of Tmall Li Xinmei?

Official discount amount = commodity activity price x official profit reduction ratio. If the commodity registration greatly promotes the first n, the activity price of the commodity is the first n prices in the first n activity time, and the logic of official reduction is if the activity price >; 100 yuan, and the discount amount corresponding to the goods is rounded to single digits. If 100 yuan ≥ activity price > 10 yuan, and the discount amount corresponding to the commodity is rounded to 1 decimal place. The activity price is ≤ 10 yuan, and the corresponding preferential amount is not rounded.