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Answer:
0.020g/lb
Explanation:
We start off with 45 mg/kg.
Let's convert the mg to g first to get half the units correct.
1g = 1000mg
Therefore 45mg = 0.045g.
Now we're at 0.045g/kg.
Next we need to convert the kg to lbs.
1 kg = 2.20462262 lbs.
therefore we need to divide 0.045 by 2.20462... to get g/lbs
This gives 0.02041165667 g/lb.
We need this to 2SF, so round to 0.020g/lb