Chapter 1.5, Problem 30E

Do Exercise 29 if cost $10$ cents per copy for the first $50$ copies and $5$ cents per copy for each copy exceeding $50$, and there is no setup fee.

Revenue from Sales The owner of a photocopy store charges $7$

cents per copy for $100$ copies and $4$

cents per copy exceeding $100$. In addition, there is setup fee of $\$2.50$ for each photocopying job.

a. Determine $R(x)$, the revenue from selling $x$

copies

b. If it costs the store owner $3$

cents per copy, what is the profit from selling $x$

copies? (Recall that the profit is revenue mines cost.)