Answer
$0.03$
Work Step by Step
$10.000=5000\left( 1+r\right) ^{25}\Rightarrow \left( 1+r\right) ^{25}=\dfrac {10000}{5000}=2\Rightarrow 1+r=\sqrt [25] {2}\approx 1.03\Rightarrow r=0.03$
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