$3-9.$ Figure $3-17$ shows a cross section through a timber beam taken where a hole $2$ in$.$ in diameter was drilled to permit the passage of a pipe. Determine $/$bar $($y$)$ with respect to the x axis, which was a centroidal axis before the hole was drilled. $($Hint: First determine $/$bar $($y$)$ with respect to the base of the section.