Boxcar, Inc., which uses a predetermined overhead rate of $40 per direct labor hour, incurred actual overhead costs of $830,000 and used 20,000 direct labor hours. How much was Boxcars over- or under-applied overhead for the month of March?

		$30,000 underapplied
		$30,000 overapplied
		$20,000 overapplied
		$20,000 underapplied