E9-6 Use the data in Exercise 9-4 to journalize the following for the periodic system:

a. Total October purchases in one summary entry. All purchases were on credit.

b. Total October sales in a summary entry. The selling price was $300 per unit and all sales were on credit. Flexon Prosthetics uses LIFO.

c. October 31 end-of-period entries for inventory in the periodic system. Flexon Prosthetics uses LIFO. Post to the Cost of Goods Sold T-account. Label each item in the account. What is the balance of cost of goods sold?