Question 17 12 pollic) Given the following data, calculate the cost of goods sold for the period using the weighted average method for a periodic inventory system. 1/1 @ $12 per unit 3/5 4/15 5/30 11/15 12/31 Beginning 40 units inventory Purchases 20 units Sale 30 units Purchases 40 units Sale 50 units Ending inventory 20 units @ $14 per unit @ $30 per unit @ $11 per unit @ $32 per unit 1) $966 2) $980 3) $960 4) $2,500