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题目问是
(1)折扣最小时发生在最便宜的物品价格也是20时。总折扣为(20%*50+10%*40)/90=14/90=15.6%
所以(1)可以
(2)仅仅给出最便宜的物品的价格无法确定总折扣。可以举极端的例子。比如3个商品价格一样,则小于15%,最贵的那个商品价格为1000,则必然大于15%

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