The cost of manufacturing $x$ toasters in one day is given by $$C(x) = 0.06 x^2 + 21 x + 310, \qquad 0 < x < 150.$$
(A) Find the average cost function $\bar{C}(x)$.

(B) List all the critical values of $\bar{C}(x)$. Note: If there are no critical values, enter 'NONE'.

(C) Use interval notation to indicate where $\bar{C}(x)$ is increasing.
Note: Use 'INF' for $\infty$, '-INF' for $-\infty$, and use 'U' for the union symbol.
Increasing:

(D) Use interval notation to indicate where $\bar{C}(x)$ is decreasing.
Decreasing:

(E) List the $x$ values of all local maxima of $\bar{C}(x)$. If there are no local maxima, enter 'NONE'.
$x$ values of local maximums =

(F) List the $x$ values of all local minima of $\bar{C}(x)$. If there are no local minima, enter 'NONE'.
$x$ values of local minimums =