Problem 6: A company is taking bids on four construction jobs. Three people have placed bids on the jobs. Their bids (in thousands of dollars) are given in the following table ( indicates that the person did not bid on the job). Person 1 2 1 50 Job 2 3 46 42 48 44 47 45 4 40 51 3 45 4 Person 1 can only do one job, but persons 2 and 3 can each do as many as two jobs. Formulate an assignment problem to minimize the cost of assigning people to jobs. (Note: For this problem, you should provide a drawing of the minimum-cost flow network. Explain in words what nodes and arcs represent, and label nodes and arcs with all relevant data. You need not solve the optimization model.)