Find the extreme values of the function $$f(x) = \frac{4 + 5 \ln x}{x}$$ on the interval $(0, \infty)$, and the (x)-value(s) at which they occur. If an extreme value does not exist, enter DNE for both the value and location. The absolute minimum value is which occurs at $x=$ . The absolute maximum value is which occurs at $x=$ .