Hooper Company uses the periodic inventory system. For the current month, the beginning inventory consisted of 200 units that cost $130 each. During the month, the company made two purchases: 300 units at $138 each and 150 units at $140 each. The company also sold 500 units during the month. Using the periodic weighted average cost method, what is the cost of ending inventory? A. $20,400 B. $66,800 C. $67,540 D. $21,000