If a company started in 2008. It purchased 10,000 units of inventory at $12 each in 2008 and sold 5000 units at $15. Then in 2009, it purchased 20,000 units of inventory at $18 each; and sold 22,000 units at $20 each. What is the size of the inventory left? What is the average cost of each unit during those two years? How much has the company earned in the past two years from selling units? What is the company annual return over the past two years?

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