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Column elimination law practice in a town has three main businesses: coal mines, power plants and railways as its economic system. production of $ 1 worth of coal (1), 0.3 yuan in electricity consumption (intermediate product) and 0.2 yuan of transportation costs (intermediate products) the production value of $ 1 electricity (2), need to consume coal fee of 0.4 yuan (intermediate products), the tariff of 0.1 yuan and 0.1 yuan of transportation costs $ 1 worth of rail transport services (products), the cost of the coal charge of 0.3 yuan and 0.2 yuan in electricity transportation fees and 0.2 yuan. In a week, in addition to the three enterprises each other needs, coal 6 million orders (ie, the final product 1), power plant to get $ 30,000 in electricity supply requirements (ie, the final product 2), while the local railway 5 million worth of transportation needs (ie, the final product 3).