Inventory costing methods-periodic method the luann company uses the periodic inventory system. the following july data are for an item in luann's inventory: july 1 beginning inventory 30 units @ $9 per unit 10 purchased 50 units @ $11 per unit 15 sold 60 units 26 purchased 25 units @ $13 per unit calculate the cost of goods sold for july and ending inventory at july 31 using (a) first-in, first-out, (b) last-in, first-out, and (c) the weighted average cost methods. round your final answers to the nearest dollar. a. first-in, first-out: ending inventory $ 600 x cost of goods sold: $ 545 x b. last-in, first-out: ending inventory 710 x cost of goods sold: $ 435 x weighted-average cost: ending inventory $ 654 x cost of goods sold $ 491 x