Sandra's Purse Boutique has the following transactions related to its top-selling Gucci purse for the month of October Sandra's Purse Boutique uses a periodic inventory system. Date October 1 October 4 Transactions Beginning inventory Sale Purchase October 10 October 13 Sale October 20 Purchase October 28. Sale October 30 Purchase Units 6 4 5 Unit Cost $780 790 800 816 Total Cost $4,680 3,950 3,200 4,860 $16,690 4. Using weighted-average cost, calculate ending inventory and cost of goods sold at October 31. (Round your intermediate answers to 2 decimal places.)