$ Beginning inventory Purchases (gross) Purchase returns Purchase discounts Transportation-in Goods available for sale Ending inventory Cost of goods sold Case 1 200 6,000 (a) 100 600 6,300 400 (b) Case 2 (0) $ 8,500 600 200 100 8,100 (d) 7,500 Case 3 400 3,800 200 100 (e) (f) 200 4,000 Requirement: For each of the above independent cases, find the missing amounts