Display % Of Transactions

I have a client that would like to allow customers on their website, to specify an organization that they would like a % of their purchase to go toward/support. From there, they would like to showcase on the website the total % of contribution from all purchases (e.g., $60,024 has been donated to local organizations).

Do you know if this is possible and how I might go about doing this?

BTW - I’m using Wix Stores