It costs $10 to make a single unit using regular production and $15 to make a single unit using overtime production. Total overtime production is limited to 1000 units for the five-month period. The manufacturing plant has a regular production capacity of 250 units per month and 200 units in inventory at the start of the planning period. There is a $5 per unit charge for holding inventory at the end of each month and a limit of 600 units ending inventory for any period. What is the minimum cost production plan if the forecast must be met with a zero ending inventory each month? a Month January February March April May Forecast 250 230 300 400 420 A) $15,850 B) $16,800 C) $16,150 D) $16,500