Given the following data, calculate the cost of goods sold for the 11/15 sale using the weighted-average method for a perpetual 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 3/5 Purchases 50 units at $10 per unit 4/15 Sale 5/30 Purchases 11/15Sale Ending 12/31. inventory 30 units at $14 per unit 20 units at $30 per unit 50 units at $15 per unit 60 units at $32 per unit 50 units a) $785 b) $771 c) $1,920 d) $720