64. Marty Besson is a salesperson who earns $25,000 per year plus 8% commission on sales. His wife
Phyllis is also a salesperson. She earns $30,000 per
year plus 5% commission on sales. Last year, Marty
and Phyllis each made sales of $10,000.
a. Write a function m(x) to represent Marty's
annual earnings, and a function p(x) to
represent Phyllis's annual earnings.
b. What does the function (m + p)(x) represent in
this situation?