The following is an aggregate plan. The following are the requirements and other data for the upcoming 6 months. Months Forecast Previous quarter's output 800 units 1 700 Beginning inventory 0 units 2 900 Backorder cost $100 per unit 3 1200 Inventory holding cost $30 per unit at end of quarter 4 600 Hiring workers $20 per unit 5 800 Laying off workers $40 per unit 6 1000 Subcontracting cost $200 per unit Unit cost $100 per unit a. Produce utilizing a chase demand by varying the workforce based on prior demand. What is the overall cost of the plan $621,000 ?