E6-17A (Learning Objective 2: Compare ending inventory and cost of goods sold by four methods) Use the data for Ontario, Inc., in Exercise 6-16A to answer the following: ? Requirements 1. Compute cost of goods sold and ending inventory, using each of the following methods: a. Specific unit cost, with three $155 units and five $165 units still on hand at the end b. Average cost c. First-in, first-out d. Last-in, first-out 2. 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?