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Kim hires students to mow lawns at $400 a week

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Kim hires students to mow lawns at $400 a week. She leases equipment that costs $450 a week.

The table gives Kim's a total product and total cost schedules

At what output is Kim's average total cost at a minimum?

Note: if two quantities have the same average total cost, we take the average quantity as that at minimum average total cost.

Kim's average total cost is at a minimum when she mows _____ lawns a week. Round answer to an integer.