Dundas Ltd uses the periodic inventory system and has the following inventory information for the month of March 2021: Date Detail Units Unit Cost 1-March Inventory 1,200 $90 9- March Purchase 4,000 $92 18- March Purchase 2,500 $96 31- March Inventory 1,600 Required: Answer the following independent questions. a) Assume that the company uses the FIFO method. The value of the cost of sales at 31 March 2021 is $_ b) Assume that the company uses the average cost method. The value of the cost of ending inventory at 31 March 2021 is Assume that the company uses the LIFO method. The value of the cost of ending inventory at 31 March 2021 is