[tex]\bf f(x)=\cfrac{600+2x}{x}\iff f(x)=\cfrac{600}{x}+2
\\\\\\
\begin{array}{cllll}
calendars&cost\\
-----&-----\\
1&\cfrac{600}{1}+2\\
2&\cfrac{600}{2}+2\\
3&\cfrac{600}{3}+2\\
4&\cfrac{600}{4}+2\\
...&...\\
600&\cfrac{600}{600}+2\implies 1+2\implies 3
\end{array}[/tex]
so.. notice, if we distribute the denominator, we end up with 600/x + 2
now, notice the table, as more calendars are printed, the 600/x is shrinking
if you print 600 calendars, it becomes 1 and the costs ends as 3 bucks only
so, 600 is an overhead cost, a cost of capital goods, most likely machinery
so, the most likely is the computer and the printer
they spent $600 on the computer and printer, so when they start printing calendars, they're under water, indebted, but as more calendars get sold, the profit begins to offset that original cost
