at a 40% discount 是打几折

at a 40% discount 是打几折 请问打八折是twenty percent discount 还是eighty percent discount ? at a discount和on sale有什么区别? 英语折扣怎么算英语中打9折是10% discount, 打8折是20% discount, 打7折是30% discount 为什么打9折不是9% discount 打8折不是8% discount 打7折不是是7%discount呢?中文中如果1件衣服100元打9折的话是 100 X 0.09=9 You can get a 40%discount. at one third discount 是打几折? discount：70%到底是打7折的意思还是打3折的意思? give a discount.翻译? There is a discount ()last year is cards.a:in,b:on,c:of,d:at. There is a discount ()last year is cards.a:in,b:on,c:of,d:at. discount可数吗?为什么是there is a discount为什么说：there are no dicount，这分明是不可数 The present value of $100 due in 5 years at a 3% discount rate.RT Do you have a discount __ the clothes?I hope I can buy them __a 20% discount.A.on;of B.on;at The discount will be funded at your cost.折扣是算在成本里吗? The CD is cheap(同义句） this is _____ ______CD.They sell the cards at a discount.(同义句）↓↓________ ________a discount ________the cards 1张票40元,文中说“people are buying filmtickets at ddiscounts of up to 60 percent',何时打4折或6折跪求discount的用法（详细的, buy them ( ) a 10% discount a 20 percent discount 是指打几折