$2\mathrm{.}1$ Serial Computing. Alex gets to use a Harvard Mark V computer from $10$am to $11$:$30$am on some specific Monday. During that time period he manages to run program C that utilizes $54$s of CPU time and $46$s of I$/$O$.$ What is the CPU utilization for the period $10$:$00$:$00$am to $11$:$30$:$00$am$?$

$($one and a half hour period$)$ Express the answer as a percentage eg $10\%$ not $0\mathrm{.}1$