a) A manager is attempting to develop a plan for the next 9 months with the following expected demand: The department has 20 full-time employees, each can produce 10 units per period at a cost of \$6per unit. Inventory holding cost is $5 per unit per period and backlog cost is $10 per unit per period. The plan will involve workingovertime with a maximum capacity of 40 units per period and cost of $10 per unit. Determine the total cost of the plan. (Tabultate your answer using the following formate)