If column AB is made from high strength precast concrete and reinforced with four 3/4 in. diameter A-36 steel rods, determine the maximum allowable floor loadings P. The allowable normal stresses for the concrete and the steel are (σ_allow)_con= 2.5 ksi and (σ_allow)_st= 24 ksi, respectively.

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A' in. 9 in. 10 ft Section a-a