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If I have two values with errors, say 4 ± 0.5 and 6 ± 1.5, the precentage increase from 4 to 6 is easy its 50 %.

But how do I deal with the errors? I want to write (50 ± X) % where X represents the error in the percentage increase. Do I just take the standard deviation of the two errors so it would be (50.0 ± 0.7) % or do I take an average so its (50 ± 1) %.

Not sure what to do with this, thanks for any pointers.