On December $1,$ Eagle Corp. sold merchandise with a selling price of $$8,000$ on account to Bobcat Inc., with terms $4/15,$ n$/60.$ On December $3,$ Bobcat Inc. returned merchandise with a selling price of $$600.$ Bobcat Inc. paid the amount due on December $12$ th$.$ How much cash did Bobcat Inc. pay Eagle Corp. on December $12$ th to pay off their accounts receivable?

$$ $$7,680$

$$ $$6,660$

$$7,400$

$$7,104$

None of the above.