I need help with this question? I'm confused about weighted average

Choco, Inc. uses a periodic inventory system. During October, Choco, Inc. sold 1,000-237 units and had 237 units in ending inventory at the end of October. If Choco, Inc. uses the Weighted Average Cost inventory method, how much is ending inventory on the balance sheet as of October 31? Date Units Costs Total costs Oct. 1 Beginning inventory 100 $2/unit $ 200 19 Purchased 900 $3/unit 2.700 $2,900 Ending inventory in October 237