From the following information for Alfred Industries, compute the overhead spending variance and the volume variance. Standard manufacturing overhead based on normal monthly volume: Fixed ($300,000/20,000 units)............. $15.00 Variable ($100,000/20,000 units).......... 5.00 $20.00 Units actually produced in current month 18,000 units Actual overhead costs incurred (including $300,000 fixed)....... $383,800