Oleksandr, good afternoon
you can try to set up with bonuses yourself, here is a video on the functionality
https://www.youtube.com/watch?v=yb0u03f5708to set up for you, it is very approximately 5 hours optimistically (you will explain in detail how everything happens with the formulas), or 10 hours pessimistically (we "extract" requirements from you, do as we understand, you test and add new requirements)