$12$ Given that $\frac{I_{cr}}{I_g}=0\mathrm{.}35$ and $\frac{M_{cr}}{M_a}=0\mathrm{.}55$ for a beam of $300mm$ and $600mm$ depth. What is the

ratio of $\frac{I_e}{I_g}?$

Select one:

a$.0\mathrm{.}35$

b$.0\mathrm{.}3916$

c$.0\mathrm{.}458$

d$.0\mathrm{.}431$