On January 3, Pronghorn Corp. purchased three portable electronic keyboards for $590 each. On January 20, it purchased four more of the same model keyboards for $514 each. During the month, it sold two keyboards; one that Pronghorn 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 $