The rate for individual tutoring is $25/hr and the rate for a group session is $35/hr. Ten students each have a personal demand for the tutoring given by P = 3 - 0.1X, where P is the price they are willing to pay for an hour of tutoring, and X is the number of hours purchased. Five more students each have a personal demand of P = 6 - 0.3X. The rest of the class is not interested in the service