The following information regarding inventory transactions is available for the month of May.

May	Date	Type of Event	# of units	Unit cost	Total Cost
	1	Beginning Inventory	100	$ 12.00	$ 1,200.00
	3	Purchase	50	$ 14.00	$ 700.00
	12	Sale	70
	15	Sale	60
	20	Purchase	100	$ 15.00	$ 1,500.00
	28	Sale	60

Determine the correct balances at May 31 for merchandise Inventory and Cost of Goods Sold under each of the following inventory methods: (a) periodic FIFO, (b) periodic LIFO, and (c) weighted average.