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题目材料：
In 1994, if 20 percent of the first-year students who took the placement exam received a score of 85 or higher, approximately what percent of all first-year students received a score of 85 or higher on the placement exam that year?
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A.30%
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B.22%
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C.18%
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D.9%
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E.4.5%
C显示答案
