The graduating class at Clinton School was 210 students a year ago. This year's graduating class is 252 students. What is the percent of increase in the size of the graduating class?

252 - 210 = 42

42/210 = ?

Multiply the decimal answer by 100 to find the percent.

To find the percent increase in the size of the graduating class, you need to calculate the difference between the sizes of the two graduating classes and then divide that by the initial size of the class (last year's graduating class) and multiply by 100 to convert it to a percentage.

First, subtract last year's graduating class size from this year's graduating class size: 252 - 210 = 42.

Next, divide this difference by the initial size of the class (210) and multiply by 100: (42 / 210) * 100 = 20.

Therefore, the percent increase in the size of the graduating class is 20%.