10% discount to parties of more than ten.十人以上团体优惠百分之十。

“打折”比较规范的说法，就是discount这个词，既可以用作名词，也可以用作动词。　　例句：
　　I can give you a small discount. 我可以给你打点折扣。
　　That store does not discount at all. 那家商店出售商品一概不打折。
　　We are selling these ties at a 5 percent discount. 这些领带我们打95折出售