Actual weight of steel bars = 2.340 kg/m, Standard weight of steel bars (20mm )= 2.470 kg/m, Load at yield point = 13100 kgf ,Load at breaking point = 14500 kgf, Maximum load = 18200 kgf, Unit weight of steel = 0.2834 lb/in^3. What is the cross-sectional area in ft^2, Yield strength, ultimate strength and breaking strength in psf?