Dilution of vape juice

i have 1 bottle of 160 ml with 3 mg nic salts = 0,3% nicotine. I hav e 1 bottle 30 ml with 50 mg nic sals = 5.0 nicote. How many mi from bottle 2 into bottle 1 to get 4 % nicotine ?

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If you pour all of bottle 2 into bottle 1 you end up with 1.4%
If you pour 7 ml from bottle 1 into all of bottle 2, bottle 2 will end up at 4.1%

Someone else can check my math.
Bottle 1 = 480mg nic
Bottle 2 = 1500mg nic
1500mg+(7ml x 3mg bottle 1) 21mg = 1521/37 = 41.1 mg/ml ~4%

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