Answer:
option (b) $900 U
Step-by-step explanation:
Data provided in the question:
Normal capacity = 4,000 units per month
Budgeted fixed overhead = $16,000
Budgeted Variable factory overhead = $20,000
Actual overhead incurred = $37,900
Now,
Budgeted variable factory overhead cost per unit = $20,000 ÷ 4,000
= $5
Flexible budget variable factory overhead = 4,200 × $5
= $21,000
Total Variable budgeted factory overhead = $21,000 + $16,000
= $37,000
Variance = Budgeted overhead - Actual overhead
= $37,000 - $37,900
= - $900
or
$900 Unfavourable
Hence, option (b) $900 U