Talk:Quests/@comment-73.252.144.12-20160213100610/@comment-26870258-20160214101500

That is the percentage of completion. If we take for example quest C3 (win 5 PvP battles), when you win your third PvP battle you'll see a green "50". If you win another one after, you'll then see a green "80". Those are the only percentage indicators you'll see when completing quests.