Shin Company sells one product. Presented below is information for January for Shin Company. Jan. 1 Inventory 300 units at $10 each 4 Sale 240 units at $16 each 11 Purchase 450 units at $12 each 13 Sale 360 units at $17.50 each 20 Purchase 480 units at $14 each 27 Sale 300 units at $18 each 3. Assume Shin uses a perpetual system and the average cost assumption. Use the information above to determine the ending inventory and cost of goods sold as of January 31st