A company purchased 100 units for $30 each on January 31. It purchased 150 units for $25 on February 28. It sold 150 units for $50 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.) $4, 250 $6, 750 $4,000 $3,000