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:
[tex]800\cdot0.15=120[/tex]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
[tex]800-120=680[/tex]This year there were 680 students enrolled for the summer program.