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If person A creates a Q or A, then person B comes in and changes it, the percent contributed will be displayed next to the original posters name.
How does that affect rep? And is there a certain level where the original poster would no longer accumulate rep for votes?
It doesn't, other than that after 6 edits a post becomes communitiy wiki and no longer accumulates rep.
Percentage is only shown on community wiki posts, which by definition don't generate any rep.
