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Willmonite-35 is a newly found radioactive substance with a half life of 550 years. How long will it take 17,000 grams of Willmonite-35 to decay

Willmonite-35 is a newly found radioactive substance with a half life of 550 years. How long will it take 17,000 grams of Willmonite-35 to decay by 10%? Round to the nearest year.

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