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 260 units.

Beginning inventory: units 100/ units cost 75/ total cost 7,500

Purchase: units 360/ units cost 95/ total cost 34,200

Purchase: units 240/ units cost 115/ total cost 27,600

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