Consider a firm that produces a product that costs $300 each at the rate of 10,000 units per week. From the time that production begins, it takes four weeks to complete. The raw material cost is $180. All of the raw materials are added to the product at the time each product is started. Assuming that labor and overhead costs are added in equal parts over the four-week processing period for each unit, determine the average value of work-in-process inventory for the firm.