A valet car wash operating in shopping centre with four hand washing bays and two vacuuming bays.
The car wash operates 8 hours per day, 6 days per week.
There are 12 employees on the line, each employee is entitled to a 1 hour break in every 8 hours.
Employees are distributed across the bays equally.
Your business charges $40 per wash and $10 per vacuum.
Each car takes 20 minutes to wash.
Each car takes 10 minutes to vacuum.