Ek feedback

Great job! Your tests and your code are both really good.

Most of my comments were about format/style of things but here are some things to think about:

- Should I be required to always pass in my parameters in decimal form? For instance, do I need to pass in `5.00` instead of `5`?
- How could you refactor the rest of your tests to have less duplication? (Mainly talking about the multiple `it` blocks)