Need questions so we can answer it
Answer:
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Jefferson assumed the excise tax bred bureaucrats and it also grabbed a toll on his fellow framers. His individual hatred for the tax and encouragement of Congress permitted for the repeal but it took a problem on the previously down federal revenue.
If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.
Thus, A would be the correct answer choice here.