Answered! 1.    The output for the below linear programming problem follows below:…

1.    The output for the below linear programming problem follows below:

Max: 25X1+30X2+15X3

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Answered! 1.    The output for the below linear programming problem follows below:…
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1) 4X1+5X2+8X3<1200

2) 9X1+15X2+3X3<1500

Optimum Solution Output

Objective Function Value = 4,700.00

Variable Value Reduced Cost
X1 140.000 0.000
X2     0.000 10.000
X3 80.000 0.000
Constraint Slack/Surplus Dual Price
1 0.000 1.000
2 0.000 2.333

Objective Coefficient Ranges:

Variable Lower Limit Current Value Upper Limit
X1 19.286 25.000 45.000
X2 None 30.000 40.000
X3 8.333 15.000 50.000

RHS Ranges:

Constraint Lower Limit Current Value Upper Limit
1 666.667 1200.000 4000.000
2 450.000 1500.000 2700.000

a.    (10 Points): Give the complete optimal solution

b.    (10 Points): Which constraints are binding?

c.     (15 Points): What is the dual price for the second constraint? What does this mean?

d.    (10 Points): Over what range can the objective function coefficient of x2 vary before a new solution point becomes optimal?

e.    (10 Points): By how much can the amount of resource 2 decrease before the dual price will change?

f.      (10 Points): What would happen if the first constraint’s right-hand side increased by 700 and the second’s decreased by 350?

2.    Consider the following linear programming problem

Max        8X + 7Y

s.t.      15X + 5Y < 75

10X + 6Y < 60

X +   Y < 8

X, Y ³ 0

a.    (10 Points): Use a graph to show each constraint and the feasible region.

b.    (15 Points): Identify the optimal solution point on your graph. What are the values of X and Y at the optimal solution?

c.     (10 Points) What is the optimal value of the objective function?

Expert Answer

 a) The optimal value = 4700

Final value of variables are:

x1 = 140

x2 = 0

x3 = 80

b) Both constraints are binding as in table 2, surplus or slack of constraints are 0

c) Dual price for constraints 2 = 2.333. It means, with each unit increase of constraints 2, the optimal function will increase by 2.333

d) Coefficient range for x2 is: (None, 40). Thus, on lower side it can be anything but on upper limit it is 40. Beyond that, the optimal solution will change

e) The x2 has current value of 1500. It can change upto 450. Thus, 1050 can be changed without impacting dual price

f) In this case, optimal solution will change but dual price will remain same for both constraints as it is within range

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