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题目来源1 : The Princeton Review
正确率：32%
难度：5
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The average annual cost to attend a private university increased at a constant rate from 1995 to 2000, and 2.5 million students attended private universities in 1998. If 2 million students attended private universities in 1990, then by approximately what percent did the total dollar amount spent on private universities increase from 1990 to 1998?
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以上解析由 考满分老师提供。
