The 1200 shirts every 6 hours is the same as 200 shirts every hour.
Then you multiply 200 by 9(total number of hours in the workday) to get 1800 (total number of shirts made in the workday).
you are trying to achieve 12,600 shirts.
So, just divide by 1800,
12600/1800 = 7
It would take 7 days to make all those shirts.
To learn more about the number of amount visits:
https://brainly.com/question/25109150