Consider the following proposed​ plan:   Quarter Demand ​(hours) Workforce Hires Layoffs Overtime ​(hours) 1 ​4,200 9 1     2 ​6,400 11 2   ​1,120 3 ​3,000 9   2   4 ​4,800 9     480 5 ​4,400 9     80 6 ​6,240 11 2   960 7 ​3,600 9   2   8 ​4,800 9     480 Total   76 5 4 ​3,120   Total cost for this plan would be

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