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Sinclaire has some radioactive material in her lab. Four years ago, there were 84 grams of the material, but now there are only 81 grams.

Sinclaire has some radioactive material in her lab. Four years ago, there were 84 grams of the material, but now there are only 81 grams.

By what percent does the amount of radioactive material decrease each year?

How many years from now will it be until Sinclaire only has half of the amount of material that she has now?

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