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The carbon-14 decay rate of a sample obtained from a young tree is 0.260 disintegration per...

The carbon-14 decay rate of a sample obtained from a young tree is 0.260 disintegration per second per gram of sample. Another wood sample found at an archaeological excavation gives a decay rate of 0.128 disintegration per second per gram of sample. Carbon-14 half-life is 5730 yr. What is the age in years of the wood object.

The answer is not 3040 yrs. I've worked it several times and that what I get, but the correct answer is more like 2700 yrs.

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