Find an Equation for the Rational Function Graph $C ( x )$

Multiple Choice

Find an equation for the rational function graph.
-If the average cost per unit $C ( x )$ to produce $x$ units of plywood is given by $C ( x ) = \frac { 1500 } { x + 50 }$ , what do 1000 units cost?

A) $\$ 30,000.00$
B) $\$ 1428.57$
C) $\$ 1499.95$
D) $\$ 500.00$