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 Item Unit ?1/1 Beginning inventory 50 units at $10 per unit ?3/5 Purchase of inventory 10 units at $10 per unit ?5/30 Purchase of inventory 25 units at $ 22 per unit ?12/31 Ending inventory 10 units A. $ 100 B. $ 135 C. $ 140. D. $ 550