On January 3, Flint Corp. purchased four portable electronic keyboards for $579 each. On January 20 , it purchased four more of the same model keyboards for $453 each. During the month, it sold two keyboards; one that Flint purchased on January 3 and one that it purchased on January 20. (a) Calculate the cost of goods sold and ending inventory for the month using specific identification. Cost of goods sold $ Ending inventory $