A company purchased 400 units for $60 each on January 31. It purchased 250 units for $30 each on February 28. It sold a total of 150 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. $22,500 B. $24,230 C. $31,500 D. $7,270