what is the correct option ? general accounting question pls solve fast

At the beginning of the year, Maple Leaf Manufacturing determined that estimated overhead costs would be $500,000, while actual overhead costs for the year totaled $520,000. Furthermore, it was determined that the estimated allocation basis would be 50,000 direct labor hours, while direct laborers actually worked 55,000 hours. What was the dollar ammount of underallocated or overallocated manufacturing overhead? a. $10,000 underallocated b. $15,000 underallocated c. $20,000 overallocated d. $30,000 overallocated