Question: Radioactive plutonium - 2 3 9 has a half life of 2 4 1 1 0 years. A drum of radioactive waste contains 4 .

Radioactive plutonium-239 has a half life of 24110 years. A drum of radioactive waste contains 4.7 kg of this isotope of plutonium initially.
How much of this plutonium-239 will re-main after 27000 years?
Answer in units of kg.

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