Given Situation: What is the percent increase from the 20 students to the 30 students. Solution: => Let’s find how many percent did it increase. Let’s have 20 as the first total number of the students in the first counts. => Then it became 30 students, let’s find out how many students added. => 30 – 20 = 10, there are 10 students added 10 is 50% of 20, thus, 50% added to the number of students. And that makes it 30 as the total count.