Answer
$10^{10.4}$.
Work Step by Step
The formula for the Decibel Scale is,
$B=10\log \frac{I}{I_0}$. Whereas $I$ is the Intensity of the sound and $I_0$ is the reference Intentisy equal to $10^{-12}$.
$\frac{B}{10}=\log \frac{I}{I_0}$,
$10^{\frac{B}{10}}= \frac{I}{I_0}$,
$I=10^{\frac{B}{10}}\times I_0$,
$I_1=10^{13.2}\times10^{-12}$,
$I_1=10^{1.2}$,
$I_2=10^{2.8}\times10^{-12}$,
$I_2=10^{-9.2}$.
Therefore, The ratio is $\dfrac{I_1}{I_2}=10^{10.4}$.
