Cost and profit analysis of tofu skin production. Bean curd skin is also called thousands of dollars. A catty of soybean is ground into soybean milk, drained and pressed into bean curd skin. A catty of beans can be made into a catty and a half of tofu skin. The cost of a catty of soybeans is about 3.50 yuan, plus other expenses, about 4.50 yuan, while a catty of tofu skin is 3.50 yuan, which can be sold for about 5.20 yuan. A kilo of soybean processed into bean curd skin can achieve a profit of about 1.20 yuan.