In 1991 the population of a town was a perfect square. Ten years later, after an increase of 150 people, the population was 9 more than a perfect square. Now, in 2011, with an increase of another 150 people, the population is once again a perfect square. Which of the following is closest to the percent growth of the town's population during this twenty-year period?<spanclass=′latex−bold′>(A)</span>42<spanclass=′latex−bold′>(B)</span>47<spanclass=′latex−bold′>(C)</span>52<spanclass=′latex−bold′>(D)</span>57<spanclass=′latex−bold′>(E)</span>62