Johnny Ocean is considering offering a new service that will send surf conditions to surfers by email. He is the only supplier of these email updates in the region. Johnny Ocean's market research indicates that there are two types of potential users: impecunious students and bodaciously leisure$-$loving executives. Let x

be the number of email updates that a surfer requests per year. The executives have an inverse demand function, PE$=160\mathrm{.}00$x

$,$ and the students have an inverse demand function, PS$=88\mathrm{.}00$x

$.$ The marginal cost of producing another surf condition email is zero.