“买四送一嘛 ,可以假设每件衬衫20元 ,原来买5件要20×5=100元 ,现在只付4件的钱 ,现价80元 ,是原价的80% ,相当于打了八折。”我指着一道选择题 ,对一位语文教师说。“说得不对吧 ,买一件两件的顾客能享受到八折的优惠吗?还不一样要照原价付。”语文教师如是说。就如冷不丁杀 “Buy four get one free, you can assume that each shirt 20 yuan, the original buy 5 to 20 × 5 = 100 yuan, and now only pay 4 pieces of money, the current price of 80 yuan, 80% of the original price, equivalent to playing eight Fold. ”I pointed to a multiple-choice question to a Chinese teacher. “To put it right, buy a two pieces of customers can enjoy the discount of 20% discount? Not the same as the original price to pay.” The language teacher said. Just as cold but not kill