A housewife saved $2.50 in buying a dress on sale. If she spent $25 for the dress, she saved about:
<spanclass=′latex−bold′>(A)</span>8%<spanclass=′latex−bold′>(B)</span>9%<spanclass=′latex−bold′>(C)</span>10%<spanclass=′latex−bold′>(D)</span>11%<spanclass=′latex−bold′>(E)</span>12%