In the employee scheduling example, suppose that the company can force employees to work one day of overtime each week on the day immediately following this five-day shift. For example, an employee whose regular shift is Monday to Friday can also be required to work on Saturday. Each employee is paid $100 a day for each of the first five days worked during a week and $135 for the overtime day (if any). Determine how the post office can minimize the cost of meeting its weekly work requirements.