Answer:
21 classes
Explanation:
Let’s set up equations for both memebers and non-members!
Let c = classes
To find how many classes it would take to make the two things even, we set them equal.
10c+100 = 15c
Solving for c,
5c = 100
So c = 20.
Since you need 20 classes to break even, to save money as a member, you need 21 classes.