Lewis Company's standard labor cost of producing one unit of Product DD is 3.80 hours at the rate of $10.30 per hour. During August, 40,200 hours of labor are incurred at a cost of $10.50 per hour to produce 10.500 units of Product DD. (a) Compute the total labor variance. Total labor variance $ (b) Compute the labor price and quantity variances. Labor price variance Labor quantity variance $ $ (c) Compute the labor price and quantity variances, assuming the standard is 4.20 hours of direct labor at $10.70 per hour. Labor price variance Labor quantity wariance