A firm uses machine hours to allocate overhead cost. During the period, budgeted variable overhead is Rs. 10000 and budgeted machine hours is 100 hours for budgeted volume of 1000 units. The firm produced 1200 units consuming 150 hours and spent Rs. 15000 towards variable overhead. The variable overhead spending variance is Zero C Rs. 5000 favorable Rs. 5000 adverse incorrect Rs. 3000 adverse C