Polygon abcde is dilated by a scale factor of 3 with the center of dilation at the origin to create polygon a′b′c′d′e′. if the endpoints of bc are b(3, 5) and c(5, 10), what is the slope of b'c'

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer