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After a plant or animal dies, its 14C content decreases with a half-life of 5730 years.

After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an archaeologist finds an ancient firepit containing partially consumed firewood, and the 14C content of the wood is only 15.0% that of an equal carbon sample from a present-day tree, what is the age of the ancient site?

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