Given the following information set up the problem in a transportation table and solve for the minimum-cost plan: PERIOD 1 2 3 Demand 550 700 750 Capacity Regular 500 500 440 Overtime 50 50 50 Subcontract 120 120 100 Beginning inventory 100 Costs Regular time $ 60 per unit Overtime $ 80 per unit Subcontract $ 90 per unit Inventory carrying cost $ 1 per unit per month Back-order cost $ 3 per unit per month Suppose that an inventory carrying cost is increased $2 per unit per period. What will the additional cost of the optimal plan be? (Omit the "$" sign in your response.) Additional cost $.