Subsidies are collected from all students and returned to all members. If there are tens of dollars left in college class fees, we can consider charging subsidies to all students and returning them to all members. You can launch a fund-raising activity to the whole class and invite everyone to contribute to the class expenses. Or return it to members, and there is no other way to use the balance. You can also refund the money to each class member according to the original payment ratio.