Jim collected salary from each school system in the state. He found that the mean annual teacher salary was distributed. The mean annual teacher salary for all the school systems was 35,000 and the standard deviation was 19,500. School system A has a mean annual teacher salary of 47,500. What percent of the school systems pay a Lower mean annual teacher salary than school A? A:26.1% B:35.9% c:64.1% D:73.9%