Standard labor-hours per unit of output Standard labor rate 8.7 hours $ 15.10 per hour The following data pertain to operations concerning the product for the last month: Actual hours worked Actual total labor cost Actual output What is the labor rate variance for the month? $16,218 F $18,437 U O $1,720 U O $2,580 F 8,600 hours $131,580 850 units