A company has two departments, $Y$ and $Z$ that incur advertising expenses of $$21,600.$ Advertising expenses are allocated based on sales. Department $Y$ has sales of $$504,000$ and Department $Z$ has sales of $$756,000.$ The advertising expense allocated to Departments $Y$ and $Z,$ respectively, are:

Multiple Choice

$$8,640$;$$12,960.$

$$12,960$;$$8,640.$

$$13,640$;$$7,960.$

$$7,960$;$$13,640.$

$$7,560$;$$14,040.$