A certain toll station on a highway has 7 tollbooths,
and each tollbooth collects $0. 75 from each vehicle
that passes it. From 6 o'clock yesterday morning
to 12 o'clock midnight, vehicles passed each of the
tollbooths at the average rate of 4 vehicles per minute.
Approximately how much money did the toll station
collect during that time period?
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A$1,500
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B$3,000
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C$11,500
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D$23,000
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E$30,000