Exercise 8-17 (Static) Average cost method; periodic and perpetual systems [LO8-1, 8-4] The following information is taken from the inventory records of the CNB Company for the month 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. 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. (Round 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. (Enter inventory reductions for sales with a minus sign. Round cost per unit to 2 decimal places.)