One year we had 120 students and the next year we had 150 students. What percentage did the population of the students grow by?

Question

Please show your work. This is a crash question but I have to do one that looks just like it. I'm sure I once knew how to do this but because it's summer break, my mind is blank! 

Answer 1

What's the difference between 120 and 150?

 

150 - 120 = 30

 

The student population increased by 30 students.

 

What percent of 120 is 30?

 

30/120 = 3/12 = 1/4 = 0.25 = 25%

 

The student population grew by 25%