$200 per unit for model DRB and $280 per unit for model DRW. The linear programming model for this problem is as follows: Maxs.t.40DRB+100DRW60DRB+200DRB+280DRW20DRB+25DRW120,00040DRWDRB,DRW38,000Manufacturingminutes108,000SteelavailableAssemblyminutes The computer solution is shown below. optimalCojectivevalue-406400.00000 1ble3050100011431000 (a) What is the optimal solution and the total profit contribution (in $ )? DRB DRW total profit contribution $ Yes, the dual value for steel available is 8.8 . Each pound of steel will increase profits more than the $2 per pound that the supplier is offering. Yes, there is no surplus of steel 50 any additional steel that becomes available should be purchased. No, the dual value for steel available is 0.6 . Each pound of steel will not increase profits enough to justify the $2 per pound that the supplier is offering. No, the allowable increase for steel is only 24 pounds, so the additional profits are not applicable for 500 pounds. No, there is a slack value of 5,636, so additional pounds of steel will not increase profits. (c) Deegan is considering using overtime to increase the available assembly time. What would you advise Deegan to do regarding this option? Explain. Constraint has a slack. Increasing the number of hours of assembly time will profits. optimal solution? Explain. The objective coefficient range for model DRB shows a lower limit of $ . Thus, the optimal solution change and the new value will be $ (e) If the available manufacturing time is increased by 500 hours, will the dual value for the manufacturing time constraint change? Explain. The allowable increase is minutes, so the dual value for this constraint change