Data picker depending on the number of participants. And number formatting problem

I would like the value (price) to be taken from the respective column according to how many participants.
Is there a guide for this?

Then I have a problem with the formatting of the numbers. Even if I specified 2 decimal places, I don’t get a rounded result. How can I solve this?
I already found the solution here. I added a round :grinning:

Community Page
Last updated: