0. Sue and Al have formed a partnership. They are planning to operate a small lumber mill producing sheets of plywood and pressboard. They have decided to split up the work in such a way that their total profit is maximized. The profit per sheet of plywood is P5, while each sheet of pressboard brings P8 a sheet profit. If Sue works a full day on plywood, she can produce 12 sheets, whereas Al can produce 10 sheets per day. If they produce only pressboard, Sue can complete 10 sheets and Al can complete 9 sheets in a day's time. Formulate the objective function and constraints for solving this problem with linear programming. Do not solve the problem, however.