For a mining company the unit transportation cost from a mine to a washery, and supply and demand are shown below:
| Washery | Supply | |||||
|---|---|---|---|---|---|---|
| A | B | C | D | |||
| Mine | M1 | 30 | 0 | 40 | 20 | 500 |
| M2 | 24 | 16 | 22 | 40 | 700 | |
| M3 | 0 | 32 | 28 | 36 | 800 | |
| Demand | 300 | 400 | 600 | 700 |
The total cost of transportation using the Vogel's approximation method is ______.
Min: 37200 Max: 37200
Answer: 37200
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