A company purchased 90 units for $20 each on January 31. It purchased 180 units for $25 each on February 28. It sold 180 units for $60 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 31? (Assume that the company uses a perpetual inventory system.) O A. $1,800 B. $4,500 C. $6,300 D. $4,050 Business Office Supplies, Inc. uses the periodic inventory system. On February 1, the corporation purchased inventory on account for $15,000. The terms of invoice were 4/10, n/30. The amount due was paid on February 9. Which of the following journal entries correctly records the payment in the books of Business Office Supplies? O A. Accounts Payable Cash 15,000 15,000 15,000 B. Accounts Payable Purchase Discounts Cash 600 14,400 OC. Accounts Payable Purchases 15,000 15,000 15,000 OD. Accounts Payable Merchandise Inventory Cash 600 14,400