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题目材料：
Total number of commuters in Country S in June 2016: 8 million
If 75 percent of the commuters were local commuters and if 20 percent of the local commuters used buses as their primary mode of transportation, what percent of all commuters who used buses as their primary mode of transportation were local commuters?
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A.6%
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B.15%
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C.30%
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D.60%
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E.75%
D显示答案
