Harris Bearing Company uses the periodic inventory system to account for its inventory. The following information was available from the companys inventory records for October:

Purchases

10/1 (balance) 2,400 units @$10

10/12 3,000 units @$5

10/25 1,500 units @$9

Sales

10/14 3,800 unites @$16

10/30 1,700 units @21

1. Calculate Harriss cost of ending inventory as of October 31 by using
   1. average cost method.
   2. FIFO costing method.
   3. LIFO costing method.