I am having a hard time with this problem.

Can someone help me?

You are provided with the following information for Najera Inc. for the month ended June 30, 2014. Najera uses the periodic method for inventory.

Date	Description	Units	Unit Cost or Selling Price
June	1	Beginning inventory	43	$40
June	4	Purchase	136	45
June	10	Sale	106	71
June	11	Sale return	15	71
June	18	Purchase	57	48
June	18	Purchase return	11	48
June	25	Sale	66	77
June	28	Purchase	31	52

Calculate cost per unit.(Round answer to 2 decimal places, e.g. 5.25.)

Weighted-average cost per unit

$

Calculate ending inventory, cost of goods sold, gross profit under each of the following methods. (1) LIFO. (2) FIFO. (3) Average-cost.(Round average-cost method answers to 2 decimal places, e.g. 1,250.25 and other answers to 0 decimal places, e.g. 1,250.)

LIFO	FIFO	AVERAGE-COST
The ending inventory	$	$	$
The cost of goods sold	$	$	$
Gross profit	$	$	$

Calculate gross profit rate under each of the following methods. (1) LIFO. (2) FIFO. (3) Average-cost.(Round answers to 1 decimal place, e.g. 51.2%.)

LIFO	FIFO	AVERAGE-COST
Gross profit rate		%		%		%