A company began January with 9,000 units of its principal product. The cost of each unit is $5. Inventory transactions for the month of January are as follows: * Includes purchase price and cost of freight. 10,000 units were on hand at the end of the month. Required: 1. Calculate January's ending inventory and cost of goods sold for the month using FIFO, periodic system. 2. Calculate January's ending inventory and cost of goods sold for the month using LIFO, periodic system. 3. Calculate January's ending inventory and cost of goods sold for the month using FIFO, perpetual system. 4. Calculate January's ending inventory and cost of goods sold for the month using Average cost, periodic system