Shown below is activity for one of the products of Denver Office Equipment: January 1 balance, 660 units @ $55 per unit $36,300 Purchases: January 10: 660 units @ \$60 per unit January 20: 1,010 units @ \$65 per unit Sales: January 12:1,000 units January 28:800 units Required: Compute the January 31 ending inventory and cost of goods sold for January, assuming Denver uses LIFO and a periodic inventory system