A company purchased 100 units for $20 each on January 31. It purchased 170 units for $30 each on February 28. It sold 170 units for $70 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 317 (Assume that the company uses a perpetual inventory system) OA. $4,100 OB. $5,100 OC. $2,000 OD. $7,100