Answer
$ b=39.95;A=37.3^{\circ}; B=52.7^{\circ}$
Work Step by Step
The trigonometric ratios are as follows: $\sin \theta= \dfrac{opposite}{hypotenuse}$ ; $\cos \theta= \dfrac{Adjacent}{hypotenuse}$ and $\tan \theta= \dfrac{Opposite}{Adjacent}$
$\sin A=\dfrac{30.4}{50.2}=0.6056$
$\implies A=37.3^{\circ}$
So, $ B=90^{\circ}- 37.3^{\circ}=52.7^{\circ}$
Thus, $ b=39.95;A=37.3^{\circ}; B=52.7^{\circ}$
