A company purchased 120 units for $ 20 each on January 31. It purchased 170 units for $ 30 each on February 28. It sold 170 units for $ 60 each from March 1 through December 31. If the company uses the firstminus​in, firstminusout inventory costing​ method, what is the amount of Cost of Goods Sold on the income statement for the year ending December​ 31? (Assume that the company uses a perpetual inventory​ system.)