Good afternoon all,

I am trying to model the following:

My company is offering to deliver a course for a school. We want to offer different levels of profit share depending upon how many students they can sign up. So we want to offer them 20% for the first 10 students, 25% for the 11-15th students and 30% for any 16 and above.

Can any of you help me with the equation that would capture this? I'm sure it's a rather easy function. I just can't seem to figure it out.

A million thanks!

James