The full-time employees can begin work at the beginning of the 7. A.M. to 9 A.M. shift, 9 A.M. to 11 A.M. shift, 11 A.M. to 1 P.M. shift, or 1 P.M. to 3 P.M. shift. The part-time employees work for 4 hours, only answer calls, and only speak English. They can start work at the beginning of the 3 P.M. to 5 P.M. shift or the 5 P.M. to 7 P.M. shift, and like the full-time employees, they are paid $10 per hour for work before 5 P.M. and $12 per hour for work after 5 P.M. Harry needs to determine how many full-time employees who speak Spanish, full-time employees who speak English, and part time employees he should hire to begin on each shift. Unexpected Results International advise him that linear programming can be used to do this in such a way as to minimize operations costs while answering all calls. Formulate a linear programming model of this problem.