Final answer:
To find the total number of letters the post office can process in 9 hours, multiply the letters processed per hour by the number of hours it is open.
Explanation:
To calculate the total number of letters the post office can process in 9 hours:
- Given: 45.6 letters processed per hour.
- Multiply the letters processed per hour by the number of hours it is open: 45.6 letters/hour * 9 hours = 410.4 letters in total.
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