The amount of a sample remaining after t days is given by the equation P (1) - Al2where A is the initial amount of
the sample and h is the half-life, in days, of the substance. A sample contains 60% of its original amount of Fermium-
257. The half-life of Fermium-257 is about 100 days. About how old is the sample?
52 days
60 days
74 days
136 days
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