Given below is the summary of the beginning inventory and purchases of merchandise made during the month for a company.

Beginning Inventory 400 units @ $8.20 = $3,280

May 3 Purchase 1,100 units @ $8.50 = $9,350

May 20 Purchase 300 units @ $8.60 = $2,580

Total 1,800 $15,210

Assume that a physical count of the inventory on May 31 indicated that 600 units were left in ending inventory at the end of the period. Use the periodic inventory system.

Using the FIFO method of inventory valuation, what is Cost of Goods Sold?