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题目材料：
If the number of hours billed by employees in the customer service job category was the same in 1999 as it was in 2000, which of the following is closest to the percent of the total number of hours billed by employees in 1999 that was billed by employees in the customer service category in 1999?
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A.19%
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B.17%
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C.15%
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D.13%
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E.12%
D显示答案
