Arock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. how long ago was the rock formed?
a. 1.25 billion years ago
b. 2.5 billion years ago
c. 3.75 billion years ago
d. 5 billion years ago
Answers: 3
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