Kirtland Corporation uses a periodic inventory system. At the end of the annual accounting period, December 31, the accounting records for the most popular item in inventory showed the following:

Transactions	Units	Unit Cost
Beginning inventory, January 1	360	$5.00
Transactions during the year:
a. Purchase, January 30	260	3.00
b. Purchase, May 1	420	6.00
c. Sale ($7 each)	(120)
d. Sale ($7 each)	(660)

Required:

a. Compute the amount of goods available for sale.

b. & c. Compute the amount of ending inventory and cost of goods sold at December 31, under Average cost, First-in, first-out, Last-in, first-out and Specific identification inventory costing methods. For Specific identification, assume that the first sale was selected two-fifths from the beginning inventory and three-fifths from the purchase of January 30. Assume that the second sale was selected from the remainder of the beginning inventory, with the balance from the purchase of May 1.