There are two main ways for the price of hydropower transformation, one is to contract for work and materials, and the other is to clear the package. If you contract materials, it depends on how much you change and whether the materials are good or not. Generally, the open line is 18-24 and the dark line is 20-28. Generally speaking, workers are required to set prices directly according to their work, or by the day. Generally speaking, by the day, the cost of workers is about per person 100.