a 50% discount怎么用英文读?

a 50% discount怎么用英文读? 50 percent discount by 20怎么读 discount怎么读 Excuse me,miss shopping now have a discount?怎么读 discount 折扣的英文怎么念 英语翻译请问discount这个词怎么用?如果打7折的话是 30% discount还是70% discount? discount不可数呀,可课本上却说there is a discount on.,用了a give a discount.翻译? 求 brand discount 英文发音 a 20 percent discount 是指打几折 buy them ( ) a 10% discount at a 40% discount 是打几折