The following information is taken from the inventory records of the CNB Company for the month of September: Beginning inventory, 9/1/2021 4,000 units @ $10.00 Purchases: 9/7 2,000 units @ $10.30 9/25 8,000 units @ $10.80 Sales: 9/10 4,000 units 9/29 4,000 units 6,000 units were on hand at the end of September. ________________________________________ Required: 1. Assuming that CNB uses a periodic inventory system and employs the average cost method, determine cost of goods sold for September and September's ending inventory. 2. Assuming that CNB uses a perpetual inventory system and employs the average cost method, determine cost of goods sold for September and September's ending inventory.