If the oil extraction rate is 25%, then 1 kg soybean can produce 0.25 kg of oil, so it can produce 0.75 kg of "bean skin".

In principle, the original production process can't be done. The yuba (soybean oil skin) is the skin that is boiled and evaporated in soybean milk. Without adding adjuvant, there is not so much output, and the output varies greatly due to the influence of raw materials, water quality and technology. Generally speaking, it will not exceed 20% (based on dried beans). In short, it will cost a lot to produce high-quality products unless other means are used for low prices.