
$\Sigma F_x = 0$
$P \cos \theta = W \sin 30^\circ$
$P \cos 45^\circ = 300 \sin 30^\circ$
$P = 212.13 \, \text{ lb}$ answer
$\Sigma F_y = 0$
$N = P \sin \theta + W \cos 30^\circ$
$N = 212.13 \sin 45^\circ + 300 \cos 30^\circ$
$N = 409.81 \, \text{ lb}$ answer