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60. E Corp. uses the periodic inventory method. On March 1, E purchased $30,000 of inventory, terms 2/10, n/30. On March 3, E returned goods that cost $3,000. On March 9, when E paid the supplier, E should credit a. Purchase Discounts for $600. b. Inventory for $600. C. Purchase Discounts for $540. d. Inventory for $540