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Originally Posted by Otaku
While doing some work with some templates, I realized I didn't know the rounding rules for the +/- 30% cap on raising/lowering a normal human character's HP or FP. Yes, p. B16 makes it clear that a realistic human with ST10 shouldn't have less than 7 HP or more than 13, but most of the time 30% doesn't give me whole numbers to work with. With CP costs and fractions, you always round up... but these aren't CP costs.
What is the RAW answer to how I should round? The recommended answer as well, if it is different from RAW?
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No answer that I can find, but Gurps power up 9 have those examples :
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ST 18 people can have HP 12-23
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HT 10-14, the “believable” range for FP ends up being, say, 7-18.
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+-30% of 18 is 12.6 - 23.4, rounded down to 12-23
+-30% of 10-14 is 7 - 18.2, rounded down to 7-18
so I guess you just drop the decimals.