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A company has three factories (O1, O2, O3) and three warehouses (D1, D2, D3). Supply and demand are balanced. Transportation cost per unit (in USD) is given in the table below:
| From \ To | D1 | D2 | D3 | Supply |
|---|---|---|---|---|
| O1 | 2 | 4 | 6 | 40 |
| O2 | 3 | 5 | 7 | 30 |
| O3 | 4 | 2 | 5 | 20 |
| Demand | 30 | 40 | 20 | 90 |