黑粉精灵
答案是 twenty percent discount.off 与 discount 都可以表示折扣，但是一般不同时出现。以”打八折“为例- 20% off - at 20% discount, 或是 discount of 20%也就是说一般出现的数字即是已经折扣掉的那部分。另外一种常用的是：make an allowance of 20%
寻梦的蒲公英
twenty percent off \discount：八折five percent off \discount：9.5折processing fee of eight yuan per gram这样读是对的。
糖糖和胖秘
20% off and 20% discount are both right, grammatically. 20% is more commonly seen.Cut corners means when you have to do something, you choose the easier way to do it. It has nothing to do with discount.
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