Acme Company's production budget for August is 17.500 units and includes the following component unit costs: direct materials, $8, direct labor, $10 : variable overhead, $6. Budgeted fixed overhead is $35,000. Actual production in August was 17,000 units. Actual unit component costs incurred during August include direct materials, $8.25; direct labor, $9.45; variable overhead, $6.82 Actual fixed overhead was $33,500. The standard direct labor cost per unit consists of 0.5 hour of labor time at $20 per hour. During August. $160,650 of actual labor cost was incurred for 7,650 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)