The total students that enrolled in the practise is 800 last year.
This year the enrollment droped by 15%, to calculate the number of students that enrolled this year, the first step is to determine how many students do 15% represent.
15% of 800 can be calculated as:
The 15% of 800 is 120, this means that the enrollment this year is 120 less than before.
Next subtract 120 from 800 to determine the nmber of students enrolled
This year there were 680 students enrolled for the summer program.