12/01 100 Beginning units Inventory @ $6/unit 12/10 100 Purchase units $8/unit 12/20 200 Purchase units $9/unit 12/31 150 Ending units Inventory Assuming that a periodic inventory system is used, what is the cost of Goods Sold under the average Cost method? Select one: O a $2,050 Ob. $2,000 Oc $1,200 Od $1,150