From the following information for Alfred Industries, compute the overhead spending variance and the volume variance. $12 Standard manufacturing overhead based on normal monthly volume: Fixed ($360,000 - 30,000 units) ........ Variable ($90,000 - 30,000 units) ......... Units actually produced in current month ..... Actual overhead costs incurred (including $300,000 fixed) ..... 3 $15 25,000 units $420,000