If \( 10 \% \) of a radioactive material decays in 5 days, then the amount of original material ...

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If \( 10 \% \) of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately
(A) \( 60 \% \)
(B) \( 65 \% \)
(C) \( 70 \% \)
(D) \( 75 \% \)
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