A company purchased 200 units for $30 each on January 31. It purchased 150 units for $35 each on February 28 . It sold a total of 200 units for $60 each from March 1 through December 31 . If the company uses the weighted - average inventory costing method, calculate the cost of ending inventory on December 31. (Assume that the company uses a perpetual inventory system. Round any intermediate calculations two decimal places, and your final answer to the nearest dollar.) A. $4,821 B. $11,250 C. $6,429 D. $4,875