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Since urine is 95% water, we need only be concerned about the 5% of "other" ingredients. Hence,
300 ml of urine X .05 [5%] = 15 ml "other" ingredients
~~~~~~~~~~
Therefore, the correct result is
2 parts per billion X .05 = 0.1 Part per Billion!
Therefore,
Actually it could be more than 95% water.
In the meantime, this kid, this Deuce Bigelow wanna-be, is now enjoying a much richer life with his female circle of friends. He’s a hero.