Answer:
c. $2,400 F
Step-by-step explanation:
The computation of the variable overhead efficiency variance for the month is shown below:
= Variable manufacturing overhead per hour × (actual direct labor hours - actual output × 0.30 hours)
= $9.6 × (2,300 - 8,500 × 0.3)
= $2,400 Favorable
Hence, the correct option is c.