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2, a cylindrical barn farm to be constructed in a number of hemispherical shell top, plan every seat barn volume of 300 cubic meters, the radius of the cylinder must not more than 3 m, a height of not more than 10 meters. Hemispherical shell roof of the building at a cost of 150 yuan per square meter, the cylindrical wall of the warehouse at a cost of 120 yuan per square meter, floor at a cost of 50 yuan per square meter, the cost of the minimum required number of barn size?