The inventory records for January 2020 showed the following data for an item of its merchandise for sale (assume that the six transactions occurred in the order shown). PURCHASES SALES Units Date Units Total Cost 2,500 3,000 Unit Cost $6.00 $6.10 4,500 3,000 $6.20 Beginning inventory (Jan. 1) Jan. 3 Purchases Jan. 5 Sales Jan. 10 Purchases Jan. 20 Sales Jan. 25 Purchases Jan. 28 Sales Total 2,500 2,000 $6.30 1,500 Compute ending inventory and cost of goods sold for the month ended January 31 using: Ending Inventory COGS Average cost (periodic inventory system). Moving average (perpetual inventory system). FIFO (perpetual inventory system). LIFO (perpetual inventory system). FIFO (periodic inventory system). LIFO (periodic inventory system)