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A company purchased 100 units for $20 each on January 31. It purchased 180 units for $30 each on February 28 It sold 180 units for $60 each from March 1 through December 31. If the company uses the first - in first-out 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) OBRE O A. $2,000 O B. $7,400 OC. $5.400 OD. $4.400