Final answer:
During Christmas, the post office can process twice as many letters compared to a usual day due to the extended operating hours.
Explanation:
During Christmas, the post office operating hours are extended to 12 hours a day. This means that during Christmas, the post office can process twice the number of letters compared to usual days, assuming that the post office operates for half the amount of time on usual days.
An example calculation would be if on a regular day the post office operates for 6 hours, during Christmas with 12 hours of operation, it can process twice the amount of letters.
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