You can earn 6 yuan per pound. The soy products processing business is very profitable. The soybeans costing 4 yuan per pound are processed into tempeh, and a pound of tempeh can be sold for 12 yuan. Therefore, excluding costs and labor, the profit from processing tempeh can be 6 yuan per pound. Profit refers to the financial results of an enterprise's production and operations within a certain period of time, which is equal to the difference between the total revenue from selling products and the total cost of producing goods.