Please show work so I can understand how to calculate this.

44) Given the following data, calculate the cost of ending inventory using the average cost method. (Round any intermediary and final answers to two decimal places.) Date 11/1 3/5 5/30 12/31 Item Beginning inventory Purchase of inventory Purchase of inventory Ending inventory Unit 50 units at $20 per unit 30 units at $10 per unit 35 units at $32 per unit 30 units A) $620.10 B) $631.20 C) $300.00 D) $1,120.00