Hi Joyce,
Natively, Trello offers reporting via Butler—this won't exactly provide a percentage of completion, but it does offer a lot of customization to report on what you want: https://help.trello.com/article/1192-creating-reports-with-butler
Beyond that, I would suggest having a look at these Power-Ups to see if any would meet your needs: https://trello.com/power-ups/category/analytics-reporting
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