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There are 3 sand careers in the area from which the sand is taken out on 7-ton trucks. Companies-suppliers S1 S2 and S3 developing careers, can supply respectively 350, 450 and 700 trucks with sand per day. In this area there are 5 plants of ferro-concrete constructions- consumers of sand Di D2 D3 D4 and Ds which are required accordingly 250, 330, 400, 300 and 220 trucks with sand on day. The cost of transportation of sand by one truck from the quarry- supplier Si to the plant-consumer Di (in conventional units) are given in the table of parameters. Create a transportation plan that minimizes transport cost. Si/Di DI D2 D2 D4 D5 Stocks(supply) SI 9 10 5 10 8 350 S1 12 5 7 6 10 450 Sa 5 6 7 9 700 Order 250 330 400 300 220 Fill in the table with the elements of the model and solve the problem in the template (2_1 eng.). Elements of the model Decision variables (Variable solutions) The Objective function Constraints (Restrictions ) Check out the Initial Feasible Solution Write conclusions. Draw a traffic graph