Rogers Products uses a periodic inventory system. The company's records show the beginning inventory of PH4 oil filters on January 1 and the purchases of this item during the current year to be as follows. Jan. 1 Feb. 23 Apr. 20 May 4 Nov. 30 Beginning inventory Purchase Purchase Purchase Purchase Totals 12 units @ $3.00 17 units @ $3.50 33 units @ $3.80 41 units @ $4.00 20 units @ $5.00 123 units $ 36.00 59.50 125.40 164.00 100.00 $ 484.90 A physical count indicates 24 units in inventory at year-end. Determine the cost of the ending inventory on the basis of each of the following methods of inventory valuation. (Remember to use periodic inventory costing procedures.) (Round your intermediate and final answers to 2 decimal places.) Ending Inventory a. Average cost FIFO c. LIFO