Acme Company's production budget for August is 18.000 units and includes the following component unit costs: direct materials. $8.00: direct labor. $11.20: variable overhead. $6.00. Budgeted fixed overhead is $44,000. Actual production in August was 18.400 units, actual unit component costs incurred during August include direct materials. $9.40: direct labor. $10.00; variable overhead. $6.60. Actual fixed overhead was $46,700. the standard direct labor cost per unit consists of 0.5 hour of labor time at $22.4 per hour. During August. $184.000 of actual labor cost was incurred for 8.000 direct labor hours. Required: Calculate the labor rate variance and labor efficiency variance for August. (Indicate the effect of each variance by selecting "F" for favorable. "U" for unfavorable.)