Select or design the most economical column to support an axial load of 550 kips. K = 1.3 and L = 16 feet. The column must fit into a 12 inch by 11 inch space. The column is to be A36 Steel. If design is needed, use a W-built-up cross section; select the W section and the thickness of the plate. Calculate Cc and use the AISC equations E2-1 and E2-2 to determine the allowable stress for each axis and ultimately the allowable load for the built-up section.