Question 1035940
The cost function would be C(x) = 15x + 8000, while the revenue function is R(x) = 35x.  (Here, x is the number of units sold.)

==> The profit function is P(x) = 35x - 15x - 8000, or R(x) = 20x - 8000.

==> The break-even level is the value of x such that P(x) = 0,  or 

20x - 8000 = 0.

==> Break-even level is 400 units sold.



{{{graph( 200, 200, -500, 500, -500, 500, 20x - 8000)}}}