Answer
52%
Work Step by Step
$R(t) = 2.7^{-(1/3)*t}$
$t=2$
$R(t) = 2.7^{-(1/3)*t}$
$R(2) = 2.7^{-(1/3)*2}$
$R(2) = 2.7^{-2/3}$
$R(2)=.5157$
52%
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