Answer
$t=8.7$ years
Work Step by Step
$P=8000, r=8\%=0.08, A=2p=16000$
$A=Pe^{rt}$
$16000=8000e^{0.08t}$
$2=e^{0.08t}$
$\ln 2=0.08t$
$t=8.66$ rounded to one decimal
$t=8.7$ years
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