Solution:
Number of items shipped                      120,000     Â
Standard direct labor-hours per item             x 0.03
Total direct labor-hours allowed                 3,600
Standard variable overhead cost per hour        x 2.85
Total standard variable overhead cost           10,260
Actual variable overhead cost incurred           11,480     Â
Total standard variable overhead cost (above) Â Â Â 10,260
Total variable overhead variance                1220 (Favourable)