Periodic Inventory System A company purchased 200 units for $20 each on January 31. Il purchased 100 units for $30 on February 28. It sold 150 units for $45 each from March 1 through December 31. Required: In the company uses the Last-in, First-out inventory costing method, what is the amount of cost of goods sold on the December 31 income statement? O a $3,500 b. $4,000 O c. $3,750 O d. $6,750