A reinforced short concrete column 250 mm x 250 mm in section is reinforced with 8 steel bars. The total area of steel bars is 1608.50 mm?. The column carries a load of 270 kN. If the modulus of elasticity for steel is 18 times that of concrete, find the stresses in concrete and steel. If the stress in concrete shall not exceed 4 N/mm², find the area of steel required so that the column may support a load of 400 kN.