What type of function helps the data

How do i work this problem out using the equation a=pe^rt

Cass decided to sell game programs for the hockey game. the printing cost was over 20 cents per program with a selling price of 50 cents each. cass sold all but 50 of the programs, and made a profit of $65. how many programs were printed? letting p represent the number of programs printed, set up an equation that describes this situation. then solve your equation for p.

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)