<span>A labor rate variance equal to zero would mean
that the standard labor rate is equal to the actual labor rate which is $16 per
direct labor-hour. To recall, the formula for labor efficiency
variance is:</span>
Labor efficiency variance = (AH - SH) × SR
Where,
AH = actual number of hours worked = unkown
SH = standard number of hours worked = 850 cranes
* 24 hours per crane = 20,400 hours
SR = standard labor rate = $16
Substituting the known values to the equation:
$8,800 = [AH – 20,400 hours] * $16 per hour
$8,800 = [AH - 20,400 hours] * $16 per hour
<span>$8,800 = (AH * $16 per hour) – ($326,400)</span>
AH * $16 per hour = $326,400 + $8,800
AH * $16 per hour = $335,200
AH = $335,200 / $16 per hour
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<span>AH = 20,950 hours</span>