Answer:
$4,200 Favorable
Step-by-step explanation:
Given the above information,
Variable overhead rate
= $57,000 / 19,000 units
= $3 per unit
Overhead variance = Real - Allocated
= $328,800 - ($3 × 21,000 + $270,000)
= $328,800 - $333,000
= $4,200 Favorable