The records of Cordova Corp. showed the following transactions, in the order given, relating to the major inventory item: Units 4,000 8,000 5,500 7,000 12,000 14,000 12,000 8,000 Unit Cost 1. Inventory $ 8.60 2. Purchase 3. Sale (at $18.40) 4. Purchase 5. Sale (at $18.40) 6. Purchase 7. Sale (at $21.40) 8. Purchase 8.90 9.20 9.36 9.50 Required: Complete the following schedule for each independent assumption. (Round unlt costs to the nearest cent.) Units and Amounts Cost of Goods Sold Gross Margin Ending Inventory Independent Assumptions FIFO a. b. Weighted average, periodic inventory system c Moving average, perpetual inventory system