Shown below is activity for one of the products of Denver Office Equipment: January 1 balance, 500 units e $50 $25,000 Purchases: January 10: January 20: 500 units $50 1,000 units $57 Sales: January800 units 12: January 780 units 28: Required: Compute the January 31 ending inventory and cost of goods sold for January, assuming Denver uses LIFO and a periodic inventory system Answer is complete but not entirely correct. Ending inventory Cost of goods sold $21,000