There were 250 students in the 7th grade class last year. this year, there are 320 students. what is the percent change in the number of 7th grade students between last year and this year?

According to the national center for health statistics, in 1990, 28 % of babies in the united states were born to parents who were not married. throughout the 1990s, this increased by approximately 0.6 % per year. if this trend continues, in which year will 52 % of babies be born out of wedlock? in__52 % of babies will be born out of wedlock