Let the total cost function $C(x)$ be defined as follows.

$)x(6,000$

Find the average cost function $\frac{?}{\text{b}\text{a}\text{r}}(C).$

$\frac{?}{\text{b}\text{a}\text{r}}(C)(x)=$

Find the marginal average cost function $\frac{?}{\text{b}\text{a}\text{r}}(C{)}^{\text{'}}.$

$\frac{?}{\text{b}\text{a}\text{r}}(C{)}^{\text{'}}(x)=$

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