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Originally Posted by PK
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Let's take the Jumper example. Since it's 100 points, it makes the percentages really easy to follow. Jumper (Naked, -30%) costs 70 points. Not arriving naked every time is effective a +30% enhancement (cancelling out the limitation).
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This has been bothering me for a long time and this is my first chance to post about it while the matter is somewhat current.
Reversing -30% to +30% is mathematically simple, but I don't think it yields the proper results.
If arriving naked every time is a -30% limitation on a 100 point advantage, it yields a 70 point advantage. Therefore, its value as an enhancement should yield the opposite result. That is, if arriving naked every time was the norm for a 70 point advantage, then not arriving naked as an enhancement should yield a 100 point advantage where the character doesn't arrive naked.
If we follow this as a +30% enhancement, we get (70 x 130% = 80 + 21 =) 91 points, rather than 100 points.
To go to 100 points from 70 points requires that the enhancement be valued as +42.86% or +43%. It's not particularly neat, but you could round it off to +40% or +45% if you don't mind being out about 2 points either side of 100.