Ferris Company began January with 9,000 units of its principal product. The cost of each unit is $8. Merchandise transactions for the month of January are as follows: * Date of Purchase Jan. 10 Jan. 18 Totals Purchases Units 6,000 Unit Cost* Total Cost $9 9,000 10 $ 54,000 90,000 15,000 144,000 Includes purchase price and cost of freight. Sales Date of Sale Units Jan. 5 5,000 Jan. 12 3,000 Jan. 20 6,000 Total 14,000 10,000 units were on hand at the end of the month.