Problem $4$:

The value of $\frac{O}{?}$ that should be used to compute $\frac{O}{M_n}$ for the section below is nearly:

a$)0\mathrm{.}90$

b$)0\mathrm{.}82$

c$)0\mathrm{.}75$

$A_s=5\mathrm{.}08i{n}^2$

d$)0\mathrm{.}65$

$f_y=60,000$

$f_c^{\text{'}}=4,000$