If Forty percent of a radioactive substance decays in five years. By what percent does the substance decay each year?

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- Oct 12th 2009, 12:31 PMRoyster123Radioactive Decay
If Forty percent of a radioactive substance decays in five years. By what percent does the substance decay each year?

- Oct 12th 2009, 12:51 PMe^(i*pi)