A firm's cost of goods sold last year was $3,410,000, and the firm operates 52 weeks per year.
It carries seven items in inventory: three raw materials, two work-in-process items, and two finished goods. The following table contains last year's average inventory level for each item, along with its value.
a. What is the average aggregate inventory value?
b. How many weeks of supply does the firm maintain?
c. What was the inventory turnover last year?

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Category Raw materials Work-in-process Finished goods Part Number 1 2 3 4 5 CO 6 7 Average Level 15,000 2,500 3,000 5,000 4,000 2,000 1,000 Unit Value $3.00 $5.00 $1.00 $14.00 $18.00 $48.00 $62.00