AHSME 1952 Problem 16

If the base of a rectangle is increased by $10\%$ and the area is unchanged, then the altitude is decreased by: $\textbf{(A) \ }9\% \textbf{(B) \ }10\% \textbf{(C) \ }11\% \textbf{(D) \ }11\frac{1}{9}\% \textbf{(E) \ }9\frac{1}{11}\%$

Dataset text NuminaMath-1.5. Quoted with source.

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9\frac{1}{11}

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