Late Return of a Rental Item

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Fees for the late return of a rental item are equal to the normal hourly rate on the day the item is due, charged for each hour after the deadline between the hours of 9:00 am and 5:00 pm, and three times the normal hourly rate for each hour between the hours of 9:00 am and 5:00 pm on each subsequent day. For such an item that was overdue, what were the late return fees last week?

(1) The regular hourly rental rate is $12.

(2) The item was 54 hours late.