A radioactive substance is known to decay at a rate proportional to the amount present. If initially there is 50 milligrams of the substance present and after two hours it is observed that the substance has lost 10% of its original mass, Find the time at which the material has decayed to one half of its initial mass.

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A radioactive substance is known to decay at a rate proportional to the amount present. If initially there is 50
milligrams of the substance present and after two hours it is observed that the substance has lost 10% of its
original mass, Find the time at which the material has decayed to one half of its initial mass. 

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