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. Complete this question by entering your answers in the tabs below. 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. Note: Round "Average Cost per Unit" to 2 decimal places. Complete this question by entering your answers in the tabs below. 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