The owner of Valley Inc. wants to maximize after-tax cash flows and is considering switching from FIFO. The following data are available for its first quarter of the year. Sales for the first quarter totaled 264 units, and a physical inventory taken on March 31 showed 120 units available in inventor Valley uses the periodic inventory system. Date Units Unit Cost January 1 (beginning inventory) Purchases: 72 $180 January 15 96 205 February 12 120 March 19 215 96 230 a. Compute cost of goods sold and ending inventory for the first quarter of the year using (1) FIFO and (2) LIFO. Note: Do not use any negative signs with your answers. b. Which of the following inventory methods would we recommend that Valley use to produce the greatest after-tax cash flows: FIFO or LIFO? c. Prepare a schedule showing the gross profit and gross profit percentage for each method in part a assuming all units sold during the quarter were at a price of $300 each. Note: Do not use any negative signs with your answers.