I have no idea what to do.

The question:

(a) Use the formula $\displaystyle 53N-(40N+1725)$ to determine the two break-even points for this manufacturer. Assume here that the manufacturer produces the widgets in blocks of 50, so a table setup showing N in multiples of 50 is appropriate.

____widgets/mo (smaller value)

____widgets/mo (larger value)

(b) Use the formula $\displaystyle 53N-(40N+1725)$ to determine the production level at which profit is maximized if the manufacturer can produce at most 1500 widgets in a month. As in part (a), assume that the manufacturer produces the widgets in blocks of 50.

____

This one got me stumped. When I put it in, I get a straight line going to infinity... I was expecting a parabola because it mentioned two break even points. I must be missing something important here.