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题目材料：
If the sales of mass-market adult hardcover books accounted for 33 percent of mass-market book sales in 2010, by approximately what percent did the dollar amount of sales of this type of book increase from 2010 to 2015 ?
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A.20%
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B.30%
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C.40%
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D.50%
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E.60%
E显示答案
