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Iodine-131 has a half-life of 8 days while iodine-125 has a half life of 60 days and are both used therapeutically for different purposes. It is determined that the correct dost of iodine-131 will have its desired effect once it has delivered 95% of its radioactivity to a patient with thyroid cancer. Unfortunately, someone messed up and administered the same quantity of iodine-125 to the patient! By the time the therapy was assumed to be complete, what percentage of the iodine-125 has decayed?

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