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Anonymous
300ng/ml is 300 micrograms per litre which is the same as 300ppb (parts per billion), or 0.3ppm (parts per million)
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In the UK about £40.
One ml is also 1 cc. Ml and cc are the same.
160 x 4 = 640 ml (or 0.64 litres).
its 4% of a litre...
80 ml