Need all parts of the question answered! Please do not skip any part of it. Question 3: Oak Tree Ltd. Inventory records for a particular development program show the following at October 31, 2016: Oct 1 Beginning inventory 5 units @ $150 = $750 15 Purchase 11 units @ 160 = 1,760 26 Purchase 5 units @ 170 = 850 At October 31, 10 units of these programs are on hand. Oak Tree Ltd. uses the perpetual inventory system. Requirements: Compute 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 Which method produces the highest cost of goods sold? Which method produces the lowest cost of goods sold? What causes the difference in cost of goods sold?