Trans Co. uses a periodic inventory system. The following are inventory transactions for the month of January. 1/1 Beginning inventory 1/5 Purchase 1/15 Purchase 1/20 Sales at $10 per unit 10,000 units at $3 5,000 units at $4 5,000 units at $5 10,000 units Trans uses the average pricing method to determine the value of its inventory. What amount should Trans report as cost of goods sold on its income statement for the month of January