$[4]$ A column is fabricated by connecting the rolled$-$steel members shown by bolts of $\frac{3}{4}-$in$.$ diameter spaced longitudinally every $5$ in$.$ Determine the average shearing stress in the bolts caused by a shearing force of $30$ kips parallel to the $y$ axis.

$[$Note: Many standard sections have tabulated properties available. An S$10$x$25\mathrm{.}4$ I$-$Section has properties: $H=10",b_f=4\mathrm{.}661",t_f=0\mathrm{.}491,t_w=0\mathrm{.}311,A=7\mathrm{.}46i{n}^2,I_x=124i{n}^4,S_x=24\mathrm{.}7i{n}^3,AC8x13\mathrm{.}7C-$ Section has properties: $W=8^{\text{'}\text{'}},b_f={2\mathrm{.}343}^{\text{'}\text{'}},t_f={0\mathrm{.}39}^{\text{'}\text{'}},t_w={0\mathrm{.}303}^{\text{'}\text{'}},A=4\mathrm{.}04$ in ${?}^2,I_x=1\mathrm{.}53$ in ${?}^4,S_x=0\mathrm{.}853i{n}^3,y_{\text{b}\text{a}\text{r}}={0\mathrm{.}553}^{\text{'}\text{'}}($Top to centroid$)]$

The answer is $10\mathrm{.}53$ksi