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Progress bar element "Descending total"?

Hi all,

I need to show a Progress Bar Element that registers a percentage remaining.

Example: My user creates a list of , incomplete, asks. Let’s say ( 37 total ). This would reflect in
the user’s Progress Bar as 100% Tasks remaining to complete.

                     As the user completes tasks the Progress Bar would reflect the change as a percentage  
                     remaining to complete.

My thinking is that I have to insert a calculation somewhere?

Has anyone tackled this before? Thoughts?