Check my work 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. Units Unit Cost $ 780 Total Cost $ 4,680 790 Date October 1 October 4 October 10 October 13 October 20 October 28 October 30 tim 3,950 Transactions Beginning inventory Sale Purchase Sale Purchase Sale Purchase 800 3,200 810 4,860 $16,690 4. Using weighted average cost, calculate ending inventory and cost of goods sold at October 31. (Round your intermediate and final answers to 2 decimal places.) Ending inventory Cost of goods sold