1, a small light steel keel factory needs three machines, each of which is about 100,000, and about 50 tons of raw materials, with a profit of 2,500-3,000 yuan per ton.

2. Gypsum board, assuming that the net profit is 20% in 20 years, the profit is 21.800 million. Assuming that the transaction volume does not increase in the next three years, the price difference can increase by 1, resulting in an additional profit of 2 billion. By the end of 2023, gypsum board contributed a net profit of 4 billion.