As Discern stated and IMO it depends on who is taking the liability responsibility end of things. Who is supplying the facility for the class room part of the course and how is the range portion of the class being handled as far as payment. I would think being paid by head count would be more beneficial on your end or a set fee for the class itself regardless of number of students. I guess it boils down to how YOU want to get reimbursed for YOUR time and effort
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