The following standards for variable manufacturing overhead have been established for a company that makes only one product: Standard hours per unit of output 5.6 hours Standard variable overhead rate $12.00 per hour The following data pertain to operations for the last month: Actual hours 2,600 hours Actual total variable overhead cost $31,330 Actual output 400 units What is the variable overhead spending variance for the month? a $112 F b $130 U c $4,450 U d $4,338 U