1953 AHSME Problem 30

A house worth 9000 is sold by Mr. A to Mr. B at a 10 % loss. Mr. B sells the house back to Mr. A at a 10$ % gain. The result of the two transactions is:

\textbf{(A)}\ \text{Mr. A breaks even} \qquad \textbf{(B)}\ \text{Mr. B gains }900 \qquad \textbf{(C)}\ \text{Mr. A loses }900\\ \textbf{(D)}\ \text{Mr. A loses }810\qquad \textbf{(E)}\ \text{Mr. B gains }1710

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