Knowledge Check $01$

Calico Company has two operating departments: Department A and Department B$.$ Department A occupies $30\%$ of the floor space of the company but accounts for $75\%$ of the sales of the company. Department B occupies $70\%$ of the floor space of the company but accounts for $25\%$ of company sales. Cleaning expense $($an indirect expense of the company$),$ which consists primarily of vacuuming the carpet is $$30,000$ each year. How much cleaning expense should be allocated to Department B$?$

$$0$

$$7,500$

$$9,000$

$$21,000$