you purchase 10 units of inventory for $5,000 on 1/15. You purchase 15 units of inventory for $7,000 on 2/28. You purchase 13 units of inventory for $9,000 on 7/15. on 12/14, you sell 18 units of inventory for a total of $32,000. Record these transactions using FIFO, LIFO, Average Cost, and showing each ending inventory.