5 ml/100gms=5ml/100,000mg=1ml/20,000mg=1part of ml /20,000parts of grams 1part of ml /20,000parts of grams = Xparts of ml/1,000,000parts of gms (1,000,000parts of grams X 1 part of ml)/20,000parts of grams= 50 parts of ml/ parts per million 50parts/million
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