Answer
$I=I_{o}\cdot 10^{0.1D}$
Work Step by Step
$\begin{array}{ll}
D=10\log\frac{I}{I_{0}} & /\div 10\\
0.1D=\log\frac{I}{I_{0}} & /10^{(...)}\\
10^{0.1D}=\frac{I}{I_{0}} & /\times I_{0}\\
I_{o}\cdot 10^{0.1D}=I &
\end{array}$
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