Ferris Company began January with 9,000 units of its principal product. The cost of each unit is $5. Merchandise transactions for the month of January are as follows: Purchases Date of Purchase Units Unit Cost+ Total Cost Jan. 10 6, 000 $ 6 $36, 000 Jan. 18 9, 000 63, 000 Totals 15,000 99, 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