Answer :
The correct answer is 35.81 micro gram.
Given : Mass of cholesterol = 3.581 * 10⁻⁵ g
Mass of g need to be converted to micro gram . Following steps can be involves :
<u>Step 1 : Find the conversion factor :</u>
1 gram = 1000000 micro gram or 10⁶ micro gram
<u>Step 2 : To do the conversion :</u>
Start with what is given and multiply with the conversion factor :

Grams being on top as well on bottom , get cancelled . Hence micro gram is left as unit .

Mass of cholesterol = 3.581 * 10¹ micro gram
Mass of cholesterol = 35.81 micro gram