Answer:
Activity variance $40 unfavorable
Step-by-step explanation:
The activity variance occurs as result of the difference between the actual level of work (activity) done and the budgeted level of work as planned.
Budgeted cost for the planned activity level of 634 frames
= 1,940 + (10 × 634)= $8280
Standard cost allowed for the actual activity level
= 1,940 + (10×638)
= $8,320
Activity variance = $8,320 - $8280 = $40 unfavorable