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precalculus

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Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?

  • precalculus -

    % = 20% / 10yrs = 2%/yr.

  • precalculus -

    An investment decreases by 4% per year for 5 years. By what total percent does it decrease after the 5 years?

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