I tutor another teacher's student every day after school because he was miserably failing math. The mom agreed to $15/hour, which is actually on the low end of what teachers around here charge (one I know charged $30/hour). We agreed to exchange services (she's a photographer) for the cost of tutoring. Well, now we've exchanged that, and I don't need any more pictures. Today she implied that it was going to cost a lot of cash to cover the cost of tutoring. I feel bad because I know they don't have a lot of money, and the student really needs the help. However, I don't want to work for free, and I feel that $15 is way less than normal already. What do you think would be fair to do? Keep charging? Cut a discount? Maybe tutor only a few times per week?