Can you please help me solve this problem? Thank you!
The current cost is 26656
Richmond | Greensboro | Charlotte | Columbia | Supply | |
Wilmington | 1049 | 830 | 790 | 826 | 8 |
Roanoke Rapids | 329 | 555 | 916 | 1181 | 10 |
new Bern | 904 | 757 | 1118 | 1172 | 9 |
Demand | 8 | 4 | 6 | 9 | |
Allocation | Richmond | Greensboro | Charlotte | Columbia | |
Wilmington | 8 | ||||
Roanoke Rapids | 4 | 6 | |||
New Bern | 9 | ||||
Total cost | 26656 |
The network is balanced. This is because Supply = Demand
This is a minimization problem
Let the factories be i ={1,2,3} and destinations be j={1,2,3,4} and the let Xij denote the quantity. The Cost between i and j be Cij. Then the objective function is
Minimize ∑ Xij*Cij
We have total of 3*4 = 12 decision variables
We have total of 7 constraints
Constraint out of Wilmington is
∑ X1j <= 8
The optimal solution is shown below
Richmond | Greensboro | Charlotte | Columbia | Supply | |
Wilmington | 1049 | 830 | 790 | 826 | 8 |
Roanoke Rapids | 329 | 555 | 916 | 1181 | 10 |
new Bern | 904 | 757 | 1118 | 1172 | 9 |
Demand | 8 | 4 | 6 | 9 | |
Allocation | Richmond | Greensboro | Charlotte | Columbia | |
Wilmington | 0 | 0 | 0 | 8 | 8 |
Roanoke Rapids | 8 | 0 | 2 | 0 | 10 |
New Bern | 0 | 4 | 4 | 1 | 9 |
8 | 4 | 6 | 9 | ||
Total cost | 19744 |
If the demands the modified then the optimal solution is shown below
Richmond | Greensboro | Charlotte | Columbia | Supply | |
Wilmington | 1049 | 830 | 790 | 826 | 8 |
Roanoke Rapids | 329 | 555 | 916 | 1181 | 10 |
new Bern | 904 | 757 | 1118 | 1172 | 9 |
Demand | 7 | 3 | 6 | 8 | |
Allocation | Richmond | Greensboro | Charlotte | Columbia | |
Wilmington | 0 | 0 | 0 | 8 | 8 |
Roanoke Rapids | 7 | 0 | 3 | 0 | 10 |
New Bern | 0 | 3 | 3 | 0 | 6 |
7 | 3 | 6 | 8 | ||
Total cost | 17284 |
The new Z value is 17284
This is a minimization problem
The model is not a balanced problem anymore because the supply does not equal demand.
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