Each operator is guaranteed a certain minimum number of hours per week that will maintain an adequate knowledge of the operation. This level is set arbitrarily at & hours per week for the undergraduate students $($K$.$ C$.,$ D$.$ H$.,$ H$.$ B$.,$ and S$.$ C$.)$ and $7$ hours per week for the graduate students $($K$.$ S$.$ and N$.$ K$.).$ The computer facility is to be open for operation from $8$ AM to $10$ PMMonday through Friday with exactly one operator on duty during these hours. On Saturdays and Sundays, the computer is to be operated by other staff. Because of a tight budget, Beryl has to minimize cost. She wishes to determine the number of hours she should assign to each operator on each day. Formulate and solve a spreadsheet model for this problem.Determine the total cost.