I got stuck in question 2, I did try to fill my answer 2 times but none of them are correct in the filling-in blank of "Sale - September 10 and Sale - September 29".

Please help me to double-check my work and help me figure out what is the correct answer. Here is my work:

First attempt:

Second attempt:

Note: Please explained clearly how you calculate the answer. Thank you!

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 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.) 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.)