Hi Devs! 


I'm a new adventurer in Salesforce and I don't have so much knowledge in developing. So I'm learning about Einstein Analytics and it is my first Superbadge in Trailhead.
I did the previous requires perfectly, like upload files and organize my org, so my question is:
- The first challenge says to do a graph that shows a churn rate (like a image below), but I cannot undertand how to do this formula. I need to do this using SAQL? Can you help me showing how I proceed to do this graph?

Thanks for help! I'm beginner in Salesforce World and I need to get knowledge in this great software!