Answer and Explanation:
The computation is shown below:
For Direct labor rate variance, it is 
= (Actual rate - Standard rate) × Actual hour
= ($14.5 - $14.8) × 2,430 hours 
= $729 favorable 
For Time variance, it is 
= (Actual hours - standard hours) × standard rate
= (2,430 hours - 2,390 hours) × $14.80 
= $592 unfavorable 
So, the Total labour cost variance is 
= $729 favorable + $592 unfavorable 
= $137 favorable