Other relevant information is as follows:

■ Workers are paid $5000 per month.

■ It costs $500 to hold a car in inventory for a month.

The holding cost is based on each month’s ending inventory.

■ It costs $4000 to hire a worker.

■ It costs $20,000 to fire a worker.

■ Each worker can make up to 8 cars a month.

■ Workers are hired and fired at beginning of each month.

■ At the beginning of month 1 there are 500 cars in inventory and 60 workers.

How can the company minimize the cost of meeting demand for cars on time?