A company purchased 100 units for $30 each on January 31. It purchased 150 units for $25 on February 28. It sold a total of 150 units for $50 each from March 1 through December 31. If the company uses the weighted-average inventory costing method, calculate the amount of ending inventory on December 31. (Assume that the company uses a perpetual inventory system.)

A.) 6,750

B.) 2,700

C.) 4,350

D.) 2,900