4) Find the most efficient (i.e., with the smallest weight per unit length) single angle tension member of A36 steel to resist the following service loads: dead load- 60 kips, live load 120 kips, and wind load = 50 kips. The member will be connected through one leg with 3/4-in diameter bolts in two lines and four or more bolts in each line (see figure below). Assume that the bolts are aligned and shear block failure is prevented. The member length is 25 feet. Use ASD. (Hint: to check for efficiency, you will need to find two shapes with close cross-sectional area, so that one satisfies the design requirements and the other one does not satisfy the design requirements) (15 points) -Bolt lines