Samuelson and Messenger (SAM) began 2021 with 320 units of its one product. These units were purchased near the end of 2020 for $24 each. During the month of January, 160 units were purchased on January 8 for $27 each and another 320 units were purchased on January 19 for $29 each. Sales of 215 units and 210 units were made on January 10 and January 25, respectively. There were 375 units on hand at the end of the month. SAM uses a periodic inventory system. Required: 1. Calculate ending inventory and cost of goods sold for January using FIFO. 2. Calculate ending inventory and cost of goods sold for January using average cost.