Lewis Company's standard labor cost of producing one unit of Product DD is 3.90 hours at the rate of $13.00 per hour. During August, 42,000 hours of labor are incurred at a cost of $13.20 per hour to produce 10,600 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 $13.40 per hour. Labor price variance Labor quantity variance