1 mg per kg is a ratio of 1 per million, or 0.000001
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1000mg=1kg 1mg=1/1000 kg 80mg=80/1000 kg\ 80mg=0.08kg
14.25 kg at 3$ per kilogram is 42.75$
kg2m / s
100,000 centigrams per kilogram.
You need to multiple the cost per kilo by 4. The answer is 14.