2009 Fermat Problem 15

On Monday, 10\% of the students at Dunkley S.S. were absent and 90\% were present. On Tuesday, 10\% of those who were absent on Monday were present and the rest of those absent on Monday were still absent. Also, 10\% of those who were present on Monday were absent and the rest of those present on Monday were still present. What percentage of the students at Dunkley S.S. were present on Tuesday?

\textbf{(A)}\ 81\%\quad \textbf{(B)}\ 82\%\quad \textbf{(C)}\ 90\%\quad \textbf{(D)}\ 91\%\quad \textbf{(E)}\ 99\%

If there are no answer choices shown, enter a numerical answer.

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