I have some 100 mg nic base and a bottle of 30 ml e liquid with zero nic. Can you tell me how much nicotine to add to make it 12 mg nic total? Also, can you tell me how to figure this out. All the calculators I have looked at ask for a total amount....I don't know what the total amt. will be since I just want to add enough nic to the 30 ml I have. Thanks for this!!