Oak Tree Ltd. Inventory records for a particular development program show the following at October 31, 2016: Oct 1 Beginning inventory 5 units @ 15 Purchase 11 units @ $150 = 160 = $750 1,760 26 Purchase 5 units @ 170 = 850 On October 31, 10 units of these programs are on hand. Oak Tree Ltd. uses the perpetual inventory system. 1. Compute the cost of goods sold and ending inventory, using each of the following methods: Specific unit cost, with two $150 units, three $160 units, and five $170 units still on hand at the end. Weighted-average cost First-in, first-out cost 2. Which method produces the highest cost of goods sold? Which method produces the lowest cost of goods sold? What causes the difference in the cost of goods sold