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 176 units, and a physical inventory taken on March 31 showed 80 units available in inventory. Valley uses the periodic inventory system. Date Units Unit Cost January 1 (beginning inventory) 48 $180 Purchases: January 15 64 205 February 12 80 215 March 19 64 230 a. Compute cost of goods sold and endi