Our math team had m students last year, but this year it has already n students! by what percent did the number of students grow? i just need the percent no formula

For this case we are going to assume the following:
 m: whole number greater than zero.
 n: integer greater than zero.
 Where,
 n> m
 According to these assumptions, the percentage of growth is given by the following formula:
 
 
 the number of students did grow by: