The total sales $S(t)$ (in thousands of CD's) for a compact disc is given by the function $$S(t) = \frac{60 t^2}{t^2 + 50},$$ where $t$ is the number of months since the release of the CD. (Note: This number does not include copies distributed via Napster.) Find $S(10)$ and $S'(10)$.

$S(10)$ =

$S'(10)$ =