Use the following data to determine the company's variable overhead spending variance for March. Budgeted fixed overhead for March $ 100 000 Actual fixed overhead for March $ 120 000 Actual variable overhead for March $ 39 500 Direct labour hours worked in March 5 000 Standard direct labour hours allowed for March 5 500 production Standard variable overhead cost per direct labour hour $ 8.00 Standard fixed overhead cost per direct labour hour $ 20.00 $500 unfavourable $500 favourable $4500 unfavourable $4500 favourable