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Suppose a factory plans to produce two kinds of products such as a and B. The main materials in stock are 3600 kg, 2000 kg B and 3000 kg in class C. The products are 9 kg, 4 kg B and 3 kg C, for each product. Each piece of product is 4 kg of material a, 5 kg B, 10 kilograms of class C. The profit of a unit product is 70 yuan, and the profit of unit B is 120 yuan. Ask how to arrange production to make the best profit of the factory