A submarine is submerged at a depth of 1213 m. If the atmospheric pressure at the surface is 0.99 bar, the water density is 1000 kg m-3 , and gravity is 9.801 m s-2 , determine:

a) The pressure on the hull of the submarine in [bar] If the volume of the sub is 3×107 ft3 , and the air density inside the sub is 1.23 kg m-3 , determine:
b) The mass of air inside the sub in [kg]
c) The mass of water displaced by the sub in [kg]
d) The buoyancy of the sub in [MN]
Show all calculations, equations, and unit conversions otherwise no points will be given.