How much nic for 24mg up from 12mg

I want to take 30ml of 12mg ejuice up to 24mg.
How much 100mg liquid nic should I add in ml or grams?
Thanks so much, I’m terrible with math. - Craig

3.6 ml
if you nic is in 100% vg 4.54.g
If your nic is in 100% pg 3.73g

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i am using 1% of 100mg nic
is it 3mg or 6mg nic ?

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Top numbers are ml.

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This came up yesterday…good information on here