Russell and Sons a CPA fum, established the following standard labor cost data for completing what the firm referred to as a Class 2 tax return Russell expected each Class 2 return to require 2 8 hours of labor at a cost of $35 per hour. The firm actually completed 610 returns. Actual labor hours averaged 25 hours per return and actual labor cost amounted to 541 per hour Required a. Determine the total labor variance and indicate whether it is favorable (F) or unfavorable (U) b. Determine the labor price vanance and indicate whether it is favorable (F) or unfavorable (U) c. Determine the labor usage variance and indicate whether it is favorable (F) or unfavorable (0) (For all requirements, do not round intermediate calculations and select "None" if there is no effect (.e, zero variance).) b Total labor variance Total labor price variance Total labor usage variance