An amplitude modulator has output (in Volts)
\[
s(t)=A \cos (400 \pi t)+B \cos (360 \pi t)+B \cos (440 \pi t) .
\]
The carrier power normalized to $1 \Omega$ resistance is $50$ Watts. The ratio of the total sideband power to the total power is $1 / 9$. The value of $\text{B}$ (in Volts, rounded off to two decimal places) is $\_\_\_\_\_\_\_$.