Design an isolated rectangular footing to support an interior column 40 cm × 40 cm in cross section and carries a dead load of 800 kN and a live load of 600 kN. Use f́ _c = 21 MPa, f _y = 420 MPa, q _{all (net)} =200 kN / m ² , γ _{s oi l} = 17 kN /m ³ , and D _f =1.25 m. Space limitations are such that one lateral dimension cannot exceed 2.5 m.