DEF Company would like to develop an aggregate plan for the next 6 months via the transportation method. Forecasted demands for the next 6 months are shown in the table below.

Month	1	2	3	4	5	6
Demand (Units)	850	1040	1260	1800	1400	1150

The available capacity of regular time, overtime and subcontract is as follows:

Supply Capacity Available (units)

Month	Regular time	Overtime	Subcontract
1	800	160	400
2	850	180	400
3	850	180	400
4	900	200	400
5	950	220	400
6	1000	240	400

The firm wants all demands to be met at the end of the month 6 and its ending inventory to be 400 units. Initial inventory is 200 units. Other costs are as in the table below:

Holding cost per unit per period	$1.5
Stock-out cost per unit per period	$4.5
Regular-time cost per unit	$50
Overtime cost per unit	$75
Subcontract cost per unit	$90

1. Find the optimum aggregate plan using Excel Solver
2. What is the total cost of the optimum aggregate plan?

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