Answer:
the  labor efficiency variance is $35,244 favorable
Explanation:
The computation of the labor efficiency variance is shown below:
As we know that
Efficiency Variance is
= Standard rate Ă— (Standard hours - Actual Hours)
= $13.20 Ă— (9.4 Ă—1,050 units - 7,200 hours)
= $13.20 Ă— (9,870 hours - 7,200 hours)
= $35,244 favorable
hence, the  labor efficiency variance is $35,244 favorable