哪位牛人帮忙解释一下这道题：
THe discount price of a sweater is 85 percent of its original cost and the discount price of a skit is 80 percent of its original cost.
比较：
the discount price of the sweater
the discount price of the skirt
答案是无法比较，是因为前面说的是一件衣服，而后面用的是the指代一类。。？
谢谢！
