Generally speaking, a catty of miscellaneous grains can produce a catty of pancakes, which can be regarded as gross profit if the price of miscellaneous grains is removed. The electricity consumption in jinao is once every two hours, and the coal consumption is not 2-5 liang per catty of pancakes, and the cost is less than 0.05 yuan per catty of pancakes. According to the local pancake price, you can estimate the profit per catty of pancakes. Pancakes vary from place to place, and the gross profit is generally 0.5 yuan per month-ranging from 3 yuan.