Marvel Parts, Incorporated, manufactures auto accessories including a set of seat covers that can be adjusted to fit most cars. According to its standards, the factory should work 1,035 hours each month to produce 2,070 sets of seat covers. The standard costs associated with this level of production are:

Total Per Set of Covers
Direct materials $ 31,878 $ 15.40
Direct labor $ 6,210 3.00
Variable manufacturing overhead (based on direct labor-hours) $ 4,347 2.10
$ 20.50
During August, the factory worked 500 direct labor-hours and produced 1,700 sets of covers. The following actual costs were recorded during the month:

Total Per Set of Covers
Direct materials (5,000 yards) $ 25,500 $ 15.00
Direct labor $ 5,440 3.20
Variable manufacturing overhead $ 4,080 2.40
$ 20.60
At standard, each set of covers should require 2.0 yards of material. All of the materials purchased during the month were used in production.

Required:
Compute the materials price and quantity variances for August.
Compute the labor rate and efficiency variances for August.
Compute the variable overhead rate and efficiency variances for August.
Note: Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values.