Number	Cost		Total
		of Books	per book		Cost
Inventory at Dec. 31, 2014		1	$85	=	$85
First purchase (Jan 2015)		1	87	=	87
Second purchase (June 2015)		2	$89	=	178
Last purchase (Dec. 2015)		1	$90	=	90
Number of books sold during 2015		1

Requirement: Based on information above, calculate 1) COGS and 2) ending inventory under the following assumptions

i) FIFO

COGS:

Ending inventory:

ii) LIFO

COGS:

Ending inventory

iii) Average Cost

COGS:

Ending inventory