The length of a rectangle is increased by 10% and the width is decreased by 10%. What percent of the old area is the new area?
<spanclass=′latex−bold′>(A)</span>90<spanclass=′latex−bold′>(B)</span>99<spanclass=′latex−bold′>(C)</span>100<spanclass=′latex−bold′>(D)</span>101<spanclass=′latex−bold′>(E)</span>110