Susan is a software salesperson. Her base salary is $2300 and she makes $60 more for every copy of Math is Fun she sells. Her total pay, P (in dollars), after
selling c coples is given by the following.
P=60c+2300
Answer the following questions.
(a) If Susan's total pay is $4280, how many coples did she sell?
coples
(b) What is Susan's total pay if she sells 21 coples?
