打8折英文怎么表达

You can have an 80% discount for all the items.或 Every item here is 20% off.或 You can buy any item here at a discount of 80%.

1楼的错了，打折这文化中国与英美国家有差异，应该说have a 20 percent discount.

20% off: 8折20% discount: 8折every item: 每件商品（强调所有的商品都打折）each item: 每件商品Every item has 20% discount. I will offer you 20% discount on each item.