Given the following data, calculate the cost of ending inventory using the weighted - average method for a periodic inventory system, rounding to the nearest dollar. (Do not round in the process of your calculations, only round your final answer.) 1/1 Beginning inventory 50 units at $10 per unit 3/5 Purchases 30 units at $14 per unit 5/30 Purchases 25 units at $15 per unit 10/25 Purchases 20 units at $16 per unit 12/31 Ending inventory 45 units $619 $581 $720 $450