Answer and Explanation:
The computation is shown below;
a. The number of actual hours spent on tune-ups is
as we know that
Total Labor Variance = Labor Rate Variance + Labor Efficiency Variance
$500U = $350F + Labor Efficiency Variance
$500 = -$350 + Labor Efficiency Variance
Labor Efficiency Variance = $850
Now
Efficiency Variance = Standard Rate × (Actual Hours - Standard Hours )
$850 = 34 × (Actual hours - 2.5 × 54)
$850 = 34Actual Hours - $4,590
$5,440 = 34 actual hours
Actual Hour = 160 Hours
b. The actual hourly rate is
Labor Rate Variance = Actual hours × (Actual rate - Standard rate)
-350 = 160 × (Actual rate - $34)
-350 = 169 Actual rate - $5,440
$5,090 = 169 Actual rate
Actual rate = $30.12