The canteen expenses of a business were allocated to production departments $1$ and $2$. The total canteen expenses allocated to production department $1$ came to $\$40\,200$. Of this amount, $\$3900$ was directly linked to a special function carried out by production department $1$. The balance was shared out according to the number of employees, which were $15$ in production department $1$ and $10$ in production department $2$. What was the total canteen cost for the whole business?
- A$\$63\,100$
- B$\$64\,400$
- C$\$67\,000$
- D$\$70\,900$