A certain radioactive isotope decays to one fourth of its original amount in 4.0 hours. How long would it take for 20% of it to decay
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A certain radioactive isotope decays to one fourth of its original amount in 4.0 hours. How long would it
take for 20% of it to decay?
A. 0.40 hours
B. 0.56 hours
C. 0.64 hours
D. 0.85 hours
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