I think we do not need to have the monitor for the bus no.5 because of she does not to collect the money from the outsider if very few days has one outsider took the bus the I think we do not need to have the monitor for the bus no.5 no outsider take the bus if like this she should pay for the member as same as others. For Khun Yupa, we can deduct from her payment through payroll by using her time sheet.
Thank you for your consideration.