Go classes run by individuals can make a profit by recruiting 9 children. If an individual runs a Go class, first make a rough estimate of the cost. According to our third-tier cities in Anhui, the monthly cost should be around 7,000 yuan if we add labor, water and electricity, and household appliances. A child has four classes a month. According to the 200 yuan calculation of each class, a child has 800 yuan money a month, which means that at least nine children must be recruited to make a profit.