Tom is a software salesperson. His base salary is $ 1600 and he makes $40 more for every copy of History is Fun he sells. His total pay, P (in dollars), after selling c copies is given by the following function. P(c) = 1600 + 40c Answer the following questions. (a) If Tom's total pay is $2880, how many copies did he sell? I copies (b) What is Tom's total pay if he sells 25 copies