periodic inventory by three methods:

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

Jan 1. inventory 200 units at $60

Feb 17. purchase 275 units at $64

July 21 purchase 300 units at $68

Nov 23 purchase 225 units at $70

there are 220 units of the item in the physical inventory at Dec. 31 The periodic inventory system is used. Determine the inventory cost by (a) the first-out method, (b) the last-in method, and (c) the weighted average cost method.