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答案：
A
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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