Sara's Boutique has the following transactions related to its top-selling Gucci purse for the month of October. Sara's Boutique uses a periodic inventory system. Date October 1 October 4 October 10 October 13 October 20 Transactions Beginning inventory Sale Purchase Sale Purchase October 28 October 30 Sale Purchase 16453477 Units 6 Unit Cost Total Cost $810 $4,860 820 4,100 830 3,320 840 5,880 $18,160 3. Using LIFO, calculate ending inventory and cost of goods sold at October 31. Ending inventory Cost of goods sold