The units of an item available for sale during the year were as follows:

Date	Line Item Description	Units and Cost
Jan. 1	Inventory	5,500 units at $4
Feb. 17	Purchase	6,400 units at $6
July 21	Purchase	6,000 units at $8
Nov. 23	Purchase	2,100 units at $10

There are 1,500 units of the item in the physical inventory at December 31. The periodic inventory system is used.

a. Determine the inventory cost by the first-in, first-out method.

b. Determine the inventory cost by the last-in, first-out method.

c. Determine the inventory cost by the weighted average cost method. Round average unit cost to two decimal places.