The fоllоwing lаbоr stаndаrds have been established for a particular product:Standard labor hours per unit of output4.5 hoursStandard labor rate$ 15.50 per hourThe following data pertain to operations concerning the product for the last month:Actual hours worked5,100 hoursActual total labor cost$ 87,360Actual output1,100 unitsRequired:Show all the numbers you use for the calculations and label the variance either U or F. a. What is the labor efficiency variance for the month? (3 pts) b. Label the variance unfavorable (U) or favorable (F). (1 pt)