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After 30 days of radioactive decay, 100 mg of a radioactive substance was observed to remain. After 120 days only 30 mg of this substance was left.

After 30 days of radioactive decay, 100 mg of a radioactive substance was observed to remain. After 120 days only 30 mg of this substance was left.

how much of the substance was initially present? what is the half-life of this radioactive substance? How long will it take before only 1% of the original amount remains?

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