Samuelson and Messenger (SAM) began 2021 with 250 units of its one product. These units were purchased near the end of 2020 for $20 each. During the month of January, 125 units were purchased on January 8 for $23 each and another 250 units were purchased on January 19 for $25 each. Sales of 200 units and 150 units were made on January 10 and January 25, respectively. There were 275 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.