Acme Company's production budget for August is 18,000 units and includes the following component unit costs: direct materials, $8.00; direct labor, $10.50; variable overhead, $6.40. Budgeted fixed overhead is $37,000. Actual production in August was 19,950 units. Actual unit component costs incurred during August include direct materials, $8.30; direct labor, $9.90; variable overhead, $7.30. Actual fixed overhead was $39,000. The standard direct labor cost per unit consists of 0.5 hour of labor time at $21 per hour. During August, $197,505 of actual labor cost was incurred for 8,550 direct labor hours. Required: Calculate the labor rate variance and labor efficiency variance for August. Note: Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)