Ferris Company began 2018 with 4,000 units of its principal product. The cost of each unit is $8. Merchandise transactions for the month of January 2018 are as follows: Purchases Date of Purchase Units Unit Cost* Total Cost Jan. 10 3,000 $ 9 $ 27,000 Jan. 18 4,000 10 40,000 Totals 7,000 67,000 *Includes purchase price and cost of freight. Sales Date of Sale Units Jan. 5 2,000 Jan. 12 1,000 Jan. 20 3,000 Total 6,000 5,000 units were on hand at the end of the month. Required: Calculate January's ending inventory and cost of goods sold for the month using each of the following alternatives: 1. FIFO, periodic system. 2. LIFO, periodic system. 3. LIFO, perpetual system. 4. Average cost, periodic system. 5. Average cost, perpetual system.