Charge by class, charge by class. According to the query of Sichuan University Network, 10 students charge by class, with one class in 36 yuan after work, one class in 28 yuan for 35 people, and one class in 20 yuan for 35 people at work. According to the class time, the fee shall not exceed 3 months, and the fee shall not exceed 60 classes, and the renewal fee shall not be earlier than the remaining 20 classes.