WHat is the percent that English derives from Latin?

I don't know if there's an actual number you can give for this question. If you're talking about vocabulary, it's probably more than 50%; if you're talking about grammar and structure, it's probably less than 50%. You'll need to be specific.

http://www.google.com/search?q=history+of+english&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA

=)

Well, I was told that Latin made up 85% of the English language. Is this true?

http://www.askoxford.com/asktheexperts/faq/aboutenglish/proportion