Does anyone know how to calculate class rank percentile? What percentile would I be if I am currently rank 20/61? In highschool​

Calculate your class rank percentile.

If using class rank, figure your class rank percentile by dividing your class rank by your class size, then subtract that number from 100 percent.

If your high school doesn't use class rank, skip to step 2 and multiply it by 2 to get your Admissions Index.

i am confused on the question.