Answer:
Jan. 1 Inventory 15,000 units at $60.00
Mar. 18 Sale 12,000 units
Cost of goods sold = 12,000 x $60 = $720,000
Inventory balance = $60 x 3,000 = $180,000
May 2 Purchase 27,000 units at $62.00
Aug. 9 Sale 22,500 units
Cost of goods sold = [($180,000 + $1,674,000) / 30,000] x 22,500 = $1,390,500
Inventory balance = [($180,000 + $1,674,000) / 30,000] x 7,500 = $463,500
Oct. 20 Purchase 10,500 units at $64.20