what do i put for beginning inventroy #of units and cost per unit?

Please specify and explain the average cost answers.

Atlanta Systems produces two different products, Product A, which sells for $450 per unit, and Product B, which sells for $800 per unit, using three different activities: Design, which uses Engineering Hours as an activity driver; Machining, which uses machine hours as an activity driver; and Inspection, which uses number of batches as an activity driver. The cost of each activity and usage of the activity drivers are as follows: Usage by Product A Usage by Product B Cost Design (Engineering Hours) Machining (Machine Hours) Inspection (Batches) $ 190,000 $1,800,000 $ 108 142 2,160 2,840 160,000 42 38 8 Atlanta manufactures 12,500 units of Product A and 10,200 units of Product B per month. Each unit of Product A uses $100 of direct materials and $45 of direct labor, while each unit of Product B uşes $140 of direct materials and $75 of direct labor.

Draw up a marginal statement that calculates the contribution per unit