Problem $2.$ Purpose: Obtain lightest section for tension member

Select the lightest One Steel PFC made with Grade $300$ steel that will safely support the service tensile loads $G=300kN$ and $Q=100kN.$ The member is $4\mathrm{.}5$ m long and is assumed to have one line of holes for $26$ mm diameter bolts in each flange. Assume that there are $3$ holes in each line with the hole centres spaced, $s_p,$ as shown in Figure $2.$

Figure $2.$ Section and bolts configuration $($not to scale$)$