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Q 1552012834.     A radioactive isotope has a half-life of 1.2 billion years.
As measgured by the presence of the isotope and its
stable decay product, a rock originally contained 10 g
of the radioactive isotope, and now contains 1.25 g.
How many years old is the rock?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)