Wert Corporation uses a predetermined overhead rate based on direct labor hours to apply manufacturing overhead to jobs. Last year, the company's estimated manufacturing overhead was $1,200,000 and its estimated level of activity was 50,000 direct labor-hours. The company's direct labor wage rate is $12 per hour. Actual manufacturing overhead amounted to $1,240,000, with actual direct labor cost of $650,000. For the year, manufacturing overhead was:. a) over-applied by $60,000b) under-applied by $60,000c) over-applied by $40,000d) under-applied by $44,000