Jose Martinez of El Paso has developed a polished stainless steel tortilla machine that makes it a​ "showpiece" for display in Mexican restaurants. His forecast of capacity and demand​ follows: Month 1 2 3 4 5 Demand 140 150 130 210 230 Capacity Regular time 140 140 150 150 160 Overtime 10 30 10 10 20 ​Subcontracting: 100 units available over the​ 5-month period Beginning​ inventory: 0 units Ending inventory​ required: 20 units Costs ​Regular-time cost per unit ​$80 Overtime cost per unit ​$115 Subcontract cost per unit ​$122 Inventory holding cost per unit per month ​$2 Assume that backorders are not permitted. Using the transportation​ method, the total cost of the optimal plan is ​$nothing ​(enter your response as a whole​ number)