To rent a tractor, it costs a total of x dollars for the first 24 hours, plus y dollars per hour for each hour in excess of 24 hours. Which of the following represents the cost, in dollars, to rent a tractor for 36 hours?
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Ax + 12y
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Bx + 36y
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C12x + y
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D24x + 12y
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E24x + 36y
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正确答案: A