Required information [The following information applies to the questions displayed below.) Ferris Company began January with 6,000 units of its principal product. The cost of each unit is $5. Merchandise transactions for the month of January are as follows: Date of Purchase Units Jan. 10 5,000 Purchases Unit Cost $ 6 Jan. 18 6,000 7 Totals 11,000 Total Cost $30,000 42,000 72,000 Includes purchase price and cost of freight. Sales Date of Sale Units Jan. 51 3,000 Jan. 12 2,000 Jan. 20 Total 4,000 9,000 8,000 units were on hand at the end of the month. 2. Calculate January's ending inventory and cost of goods sold for the month using LIFO, periodic system.