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$7$. The frequency table shows the students' scores on a recent math test. What percentage of the students scored at least $81$ on the test?$\newline$\begin{tabular}{|c|c|}$\newline$\hline Score & Frequency \\$\newline$\hline $41-50$ & $1$ \\$\newline$\hline $51-60$ & $2$ \\$\newline$\hline $61-70$ & $8$ \\$\newline$\hline $71-80$ & $12$ \\$\newline$\hline $81-90$ & $20$ \\$\newline$\hline $91-100$ & $7$ \\$\newline$\hline$\newline$\end{tabular}