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. Assuming that CNB uses a periodic inventory system and employs the average cost method, determine cost of goods sold for September and ending inventory. Note: Round "Average Cost per Unit" to 2 decimal places. 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. Note: Enter inventory reductions for sales with a minus sign. Round "Average Cost per Unit" to 2 decimal places