[Disclaimer: IMO . . . ]
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Unweighted. And just put 3.8/4.0. Adding extra digits looks like you’re a try-hard gunner; it’s like flagging for them that you don’t have straight As and you’re worried about it. You do unweighted because otherwise they’ll probably unweight anyway. I always say stay understated–the unweighted GPA like that is clean and easy for your AO. And bottom-line: they are looking at your transcript. This reported GPA on Common App is just a handy item for the AO on quick glance.
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I’m not gonna touch that one. Too many people on this platform already don’t like me.