Question: What would be the steps to solve this natural log question: The half-life of uranium-235 atoms is approx 700 million years. What % concentraition of

What would be the steps to solve this natural log question:

The half-life of uranium-235 atoms is approx 700 million years. What % concentraition of U-235 atoms would there be in a rock sample from the meteor collision that probably killed the dinosaurs 60 million years ago? (in nearest percentage)

thanks!

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