Brianna's Boutique has the following transactions related to its top-selling Gucci purse for the month of October. Brianna's Boutique uses a periodic inventory system. Date October 1 Transactions Beginning inventory October 4 Sale October 10 October 13 October 20 October 28 October 30 Purchase Sale Purchase Sale Units Unit Cost Total Cost 6 $800 $4,800 4 5 810 4,050 3 4 820 3,280 7 Purchase 6 830 4,980 $17,110 Required: 1. Calculate ending inventory and cost of goods sold at October 31, using the specific identification method. The October 4 sale consists of purses from beginning inventory, the October 13 sale consists of one purse from beginning inventory and two purses from the October 10 purchase, and the October 28 sale consists of three purses from the October 10 purchase and four purses from the October 20 purchase. Ending inventory Cost of goods sold