1951 AHSME Problem 8

The price of an article is cut 10 \%. To restore it to its former value, the new price must be increased by:

\textbf{(A) \ } 10 \% \qquad\textbf{(B) \ } 9 \% \qquad \textbf{(C) \ } 11\frac{1}{9} \% \qquad\textbf{(D) \ } 11 \% \qquad\textbf{(E) \ } \text{none of these answers}

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.