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Description: 1, 2, 3, three city each year to 320250 and 350 respectively, power supply unit, an I, II provides two power stations, the maximum power supply which is 400 units and 450 units respectively, the unit cost (yuan) as shown in the following table. Because the demand is greater than the supply available, decided to supply 1 of the city can be reduced by 0 units to 30 units, the supply of city 2 unchanged, the supply is not less than 270 of the city 3 units, try to seek the lowest total cost allocation scheme (the power supply will be exhausted).
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