Mackinaw Manufacturing Corporation uses a predetermined overhead rate based on direct labor-hours to apply manufacturing overhead to jobs. Last year, the Corporation worked 20,400 actual direct labor-hours and incurred $145,600 of actual manufacturing overhead cost. They had estimated at the beginning of the year that 17,700 direct labor-hours would be worked and $141,600 of manufacturing overhead costs incurred. The Corporation had calculated a predetermined overhead rate of $8 per direct labor-hour. The Corporation's manufacturing overhead for the year was: Multiple Choice overapplied by $4,000 underapplied by $4,000 overapplied by $17,600 underapplied by $17,600