Oahu Kiki tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing method at the end of each month as if it uses a periodic inventory system. Assume Oahu Kikis records show the following for the month of January. Sales totaled 310 units.

	Date	Units	Unit Cost	Total Cost
Beginning Inventory	January 1	240	$ 80	$ 19,200
Purchase	January 15	360	90	32,400
Purchase	January 24	200	110	22,000

Required:

Calculate the cost of ending inventory and cost of goods sold using the (a) FIFO, (b) LIFO, and (c) weighted average cost methods.