Formulate an integer programming model to develop a schedule that will satisfy the restaurant$$s

customer service needs while minimizing total labor costs, and then determine the optimal schedule

of employees. As a hint, let xi be the number of full$-$time employees who come on duty at the

beginning of hour i$,$ and let yi be the number of part$-$time employees who come on duty at the

beginning of hour i$.$ How many decision variables do you actually need?