what is Plan B's cost?

Costs Holding cost Subcontracting Regular-time labor Overtime labor $8/ refrigerator/ month $80/ refrigerator $12/ hour $18/ hour for hours above 8 hours/ worker/ day $40/ refrigerator $80/ refrigerator none Hiring cost Layoff cost Stockout cost Other Data Current workforce (December) Labor hours/ refrigerator Workdays/ month Beginning inventory Units demanded in December 8 people 4 hours 20 days 250 refrigerators 320 refrigerators Month January February March April May June Demand Forecast 400 500 550 700 800 700 b) Plan B: Use a constant workforce of ten, letting inventory fluctuate. Complete the following table (enter your responses as whole numbers) Regular Time Shortage Period Jan Feb Demand 400 Increase (Units) 80 0 Decrease (Units) 0 Production 400 400 400 500 Ending Inventory 250 150 0 0 0 0 Mar 0 0 300 0 0 Apr May June 550 700 800 700 400 400 400 0 0 0 0 0 400 300 0 0 Pian B's cost = $(enter your response as a whole number)