Answer:
a. Standard direct labor rate per hour = Hourly wage rate + Payroll taxes + Fringe benefits
Standard direct labor rate per hour = $16.70 + $0.60 + $1.40
Standard direct labor rate per hour = $18.70
b. Standard direct labor hours per gallon = Actual production time + Rest periods and cleanup + Setup and downtime
Standard direct labor hours per gallon = 1.60 hours + 0.30 hours + 0.20 hours
Standard direct labor hours per gallon = 2.1 hours
c. Standard labor cost per gallon = Standard direct hours per gallon * Standard direct labor rate per hour
Standard labor cost per gallon = 2.1 hours * $18.70
Standard labor cost per gallon = $39.27