Hello !

I have a complex commission question and wondering if someone can help me with that. It goes like:

For the first 10 units, I get a commission of $150. From 11 to 20 (the next 10 units), I get $200. For the next 10 units (from 21 to 30), I get $250.

What would be the formula to know the commission of 600 units (or any number of unit (it could be 610 units also)?

Thank you for your kind help.