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I was almost amazed at the correct math. A "200% improvement" is definitely "three times what it was previously." But I'm not entirely convinced +200% is a "threefold increase" (I'm a math guy, not a 'human language is fuzzy and ambiguous' guy.)

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Starting out with x and ending up with 3x is is a 200% improvement. You think "threefold increase" should mean x+3x=4x?

I thought I was pretty clear that I don't know what "threefold increase" should mean. Sounds like "an increase of three times normal," that's normal (x) plus three times more (3x). so x+3x seems like a reasonable definition.

Like I implied, human language is ambiguous.

Yeh, this is weird. A "50% increase" is clearly "in addition to", whereas "threefold" reads as "in comparison to". I have no idea how to interpret a "onefold increase".

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