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The inventory records of DELTA Corp showed the following for August: Number of Units Unit Cost $5 $5 Date Transaction 400 400 600 100 1.000 700 1.000 600 600 1,200 Beginning inventory Purchase No. 1 Sale No..1 Sale No.2 8/3 8/5 8/11Purchase No. 2 8/17Sale No. 3 8/19Purchase No. 3 8/21Sale No. 4 8/28Sale No. 5 8/29Purchase No. 4 8/30Ending inventory $7 $7 $9 Required: A. Calculate ending inventory and cost of goods sold under each of the following methods assuming the periodic inventory system Method Ending Inventorv Cost of Goods Sold a. Weighted-average $ b. FIFO c. LIFO B. What could be seen as an advantage of each of the inventory methods