A company makes pens. They sell each pen for $$\displaystyle {9}$.
Their revenue is represented by $\displaystyle$R = 9 x$\displaystyle$.
The cost to make the pens is $$\displaystyle {1}$ each with a one time start up cost of $$\displaystyle {6500}$.
Their cost is represented by $\displaystyle$C = 1 x + 6500$\displaystyle$.
a) Find the profit, P, (P = R - C) when the company sells 1000 pens.



b) Find the number of pens they need to sell to break even (when R = C).