What is the perfect from Barb sk with eg.? Extra Gold in % how many?

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The max Extragold on a small charm is 10eg , grandcharm 40eg

Perfect gold find on a grand charm is 40%.
Generally you'll use 9 of these (leaving room for a torch and anni) so you could have 360% gold find from grand charms alone.

If this wasn't just a general question and you were referring to making a gf barb, you might want to check the guide below. It's a pretty good set up for a gold finder!
http://forums.d2jsp.org/topic.php?t=20725984

Feel free to pm me if you have any other Diablo 2 related questions