Please only answer section b$!!!$

b$)$ Assuming the centroid of the cross section $(\frac{?}{\text{b}\text{a}\text{r}}(y)$ is $5\mathrm{.}7$ in from the bottom and that it's moment of Inertia is $1,127$ in$^4,$ compute the maximum bending stress $($units of psi$).$