Sapphire Aerospace operates 52 weeks per year, and its cost of goods sold last year was $6,500,000. The firm carries eight items in inventory: four raw materials, two work-in-process items, and two finished goods. Table 12.3 shows last year's average inventory levels for these items, along with their unit values.
a. What is the average aggregate inventory value?
b. How many weeks of supply do the firm have?
c. What was the inventory turnover last year?

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Category Part Number RM-1 RM-2 RM-3 RM-4 Average Inventory Units 20,000 5,000 3,000 1,000 6,000 8,000 1,000 500 Value per Unit Raw materials $1 10 12 65 Work-in-process WIP-1 WIP-2 FG-1 FG-2 Finished goods