Calculate the total cost for each aggregate plan using these unit costs. Regular cost per unit = $40. Overtime cost per unit = $50. Subcontract cost per unit = $10. Carrying cost per unit per month = $10 and is assessed on average inventory. a. We have the following aggregate plan. Calculate the cost of the plan: Period Jan Feb Mar Apr May Jun Forecast 300 320 320 340 320 320 Output Regular 300 300 300 300 300 300 Overtime 20 20 20 20 20 20 Subcontract 0 0 0 0 0 0