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A particular pain relieving medicine has a decay rate of 16 % per hour. A patient was given a dose of the medicine 7 hours

A particular pain relieving medicine has a decay rate of 16 % per hour. A patient was given a dose of the medicine 7 hours ago and there is currently 66 milligrams of the medicine in the patients bloodstream.

What was the original dose of the medicine?

__________milligrams

How long will the patient need to wait for there to be less than 25 % of the original dose of the medicine left in their bloodstream?Express your answer as a decimal to the nearest tenth of an hour. _________hours

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