The cross section at right is made of 2024-T3 (Ftu=62 ksi, E=10.5 Msi, Ec=10.7 Msi) aluminum clad sheet. Dimensions of the angle are bı=1.25", b2=1.75", 11=0.050", & t2=0.080". If the angle is 20" long, and the ends can be considered pinned, determine the critical buckling allowable Per for the angle & the allowable buckling stress Ocr. -t, Per = 6.04 kips, For = 30.4 ksi.