Ferris Company began 2018 with 6,000 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 Jan. 10 Jan. 18 Unit Cost* Units 5,000$9 6,000 11,000 Total Cost $45,000 60,000 $105,000 10 Totals Includes purchase price and cost of freight. Sales Jan. 5 Jan. 12 Jan. 20 Date of Sale Units 3,000 2,000 4,000 9,000 Total 8,000 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