Answer
(a) $500+10x$
(b) $35x$
(c) $25x-500$
(d) $20$ units. No.
Work Step by Step
Identify the given quantities: $C_f=500, C_v=10, P_i=35$, we have:
(a) the cost function: $C=C_f+C_vx=500+10x$
(b) the revenue function: $R=P_ix=35x$
(c) the profit function: $P=R-C=25x-500$
(d) break-even point: $P=0$ given $x=20$ units. With the restriction that no more than 18 units can be sold, the product should not be produced.
