Answer:
$1,910 unfavorable
Explanation:
The computation of the variable factory overhead controllable variance is shown below:
= Standard variable factory overhead - Actual variable factory overhead
where,
Standard variable factory overhead equals to
= 4,200 units × 7 standard hours per unit × $2.70 per hour
= $79,380
And, the other items values would remain the same
Now put these values to the above formula
So, the value would be equal to
= $79,380 - $77,470
= $1,910 unfavorable