Three identical units of merchandise were purchased during May, as follows:

		Magnesium XP	Units	Cost
May 3		Purchase	1	$130
10		Purchase	1	136
19		Purchase	1	142
Total			3	$408

Assume that two units are sold on May 23 for $313. Determine the gross profit for May and ending inventory on May 31 using (a) FIFO, (b) LIFO, and (c) average cost methods.

	Gross Profit	Ending Inventory
a. First-in, first-out (FIFO)	$	$
b. Last-in, first-out (LIFO)	$	$
c. Average cost	$	$