Neither of those constructions should be used. If we want to say A=2B, we should say "A is two times B." "Greater than" or "more than" in this context is unnecessary and a bit confusing. (And yes, Rajeev is right about "more than.") If I did see either of those, I'd still read it as A=2B, but I don't think the GMAT would use that kind of wording.
However, "A is 200% greater than B" means A = B + 2B.
Dmitry Farber | Manhattan GMAT Instructor | New York
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