The Rock Shop shows the following data related to an item of inventory: Inventory, January 1 300 units @ $5.00 = $1,500 Purchase, January 9 1300 units @ $6.00 = 7,800 Purchase, January 19 400 units @ $8.00 = 3,200 Total 2,000 units = $12,500 Inventory, January 31 600 units What is value assigned to January cost of goods sold if the average cost method is used? Group of answer choices 8750 8862 9100 3750