\( 90 \% \) of a radioactive sample is left undecayed after time t ...

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\( 90 \% \) of a radioactive sample is left undecayed after time t has elapsed. What percentage of the initialsample will decay in a total time \( 2 \mathrm{t} \) :
\( \mathrm{P} \)
(A) \( 20 \% \)
(B) \( 19 \% \)
(C) \( 40 \% \)
(D) \( 38 \% \)
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