b$.$ Suppose there is one worker at each operation now. Adding another worker to an operation can double the capacity of that operation. If the manager has three more workers to assign, what is your recommendation? What is the final capacity of this process after adding these three workers?

The first worker should be assigned to operation $.$ The second worker should be assigned to operation $.$ The third worker should be assigned to operation $.$

The final capacity of this process after adding these three workers is units per hour.