design an objective formula that accounts for BOTH performance and cost.

You want to maximize performance,

You want to minimize costs paid $($salaries$)$

There are varying salaries based on job types and skill levels

Variables:

We have $3$ different job types Manager, key holder, Sales Clerk

We have $5$ skill levels with $5$ being the most experienced; $1$ beign the least.

You must: have $50$ employees.

Such that:

No partial days worked. $($integer solution$)$

Our employees can only work the jobs they are designated for.

Our company works $7$days a week.

Our company works $2$ shifts a day.

We must try to have everyone work an equal number of days. It is OK to have someone in each job type work one day more or less than another, but not $2$ days.

Every job type must work every day.