This is a way to introduce students to compounding continuously.
Compound Interest, Clip 1, 2:49
The teacher distributes the work amongst the students in order for them to see what happens as the number of compounding periods increases. Generally students believe that the more times per year it is compounded the more interest they make, they are unaware of the limiting value.
In this case the instructor uses a slide to show the students how their return levels off. This is a nice excercise to lead in to the introduction of e.