We have the following:
The first thing is to calculate how many mcg for an 80 pound person.
We know that
1 kg = 2.2 pounds
80 pounds * 1 kg/ 2.2 pounds = 36.3 kg
now,
[tex]25\frac{\text{mcg}}{\operatorname{kg}}\cdot36.6\operatorname{kg}=915\text{mcg}[/tex]now,
1 mcg = 0.001 mg
therefore:
[tex]915\text{mcg}\cdot\frac{0.001mg}{\text{mcg}}=0.915mg[/tex]the milligram per milliliter ratio is 1 to 1, therefore 0.915 milliters is the correct answer