Hey guys. I just ordered the 10ml SOE and the 5ml NPA. How do i go about mixing them to create DD#1 at 70% SOE and 30% NPA?

Should I just add 4.2857mls of NPA to the 10mls of SOE? That would give exactly 30% NPA and 70% SOE, by ml.
Thus, 14.2857 mls total: 70% SOE (10mls) and 30 % NPA (4.2857mls) weighted by ml.

Or do i mix them based on mg concentrate? If the 10ml bottle of SOE contains 5mg of pheromone content, then I would add 2.14285 mgs of the NPA (which would be 4.46427 mls of the 5mls because the 5mls contains 2.4mgs of phereomone content.)
Thus, 14.46427 mls total: 70% SOE (10mls) and 30 % NPA (4.46427mls) weighted by mg.

Hope that makes sense.
Thanks,
Hookem146