Gary`s Gas Station serves an average of 20 cars per hour on Saturdays, 10 cars per hour on Sundays, and 9 cars per hour on all other days of the week. If the station is open from 6 a.m. to 10 p.m. every day, how many cars does Gary`s station serve over the course of a typical week?
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A1,160
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B1,200
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C1,240
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D1,280
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E1,320
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正确答案: B