Adobe stock Contributor I am paid $21 for a video download, how do I calculate what the person paid?

I m an Adobe stock contributor and had my first download of a video content.
Adobe paid me $21 for the download.
What I can not figure out is :
How does the 35% payout work in their caluculation?
- The HD video costs $104.99 - 35% of that would be $36,40
- The 4K video costs $261.99 - 35% of that would be $91,35

How do I calculate what the person paid or bought?
How did I end up with $21?
What calculation did they use?

Thank for any help 🙂