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