The following information is taken from the inventory records of the CNB Company for the month of September:

Beginning inventory, 9/1/2021	7,000	units @ $10.00
Purchases:
9/7	3,000	units @ $11.00
9/25	10,000	units @ $11.50
Sales:
9/10	4,000	units
9/29	5,000	units
11,000 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.