Several sports are broadcasted on public TV networks in Australia. Assume that the marginal cost of broadcasting one hour of sport >0. John, Lisa, and Malcom are sports fans. With p standing for the price of watching one hour of sport and standing for the number of hours of sport, John has a demand of =33, Lisa has a demand of =44 and Malcom has a demand of =55.

Determine the economically efficient amount of sport broadcasting for the three fans when =0.20.