8. The firm uses the periodic system, and there are 20 units of the commodity on hand at the end of the year. What is the ending inventory balance at the end of the year according to the LIFO method? a. $655 b. $620 c. $690 d. $659 2. Control of inventory should begin as soon as the inventory is received. Which of the following internal control steps is not done to meet this goal? a. check the invoice to the receiving report b. check the invoice to the purchase order c. check the invoice with the person who specifically purchased the item d. check the invoice extensions and totals