Suppose a Manufacturer Has Determined That the Total Cost C $C = 0.6 x ^ { 2 } + 14 x + 54,000$

Multiple Choice

Suppose a manufacturer has determined that the total cost C of operating a factory is $C = 0.6 x ^ { 2 } + 14 x + 54,000$ where $x$ is the number of units produced. At what level of production will the average cost per unit be minimized? (The average cost per unit is $\mathrm { C } / x$ .)

A) $x = 300$ units
B) $x = 330$ units
C) $x = 30$ units
D) $x = 60$ units
E) $x = 600$ units