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If 20% of a radiactive element decays in 10 days, then amount of original material left

If 20% of a radiactive element decays in 10 days, then amount of original material left after 30 days is (approx)

Options

(a) 78%
(b) 62%
(c) 51%
(d) 48%

Correct Answer:

51%

Explanation:

No explanation available. Be the first to write the explanation for this question by commenting below.

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