The water pressure at a point below the surface of the sea is caused by both the height of water

The water pressure at a point below the surface of the sea is caused by both the height of water above the point and the air pressure above the surface. If a diver reaches a depth of 20m below the surface of the sea
Calculate: a.the additional pressure on him due to the height of the seawater alone b. the total pressure on him Density of sea water= 1150kg/m³Air pressure=1.0×10⁵Pa g=9.8m/s²​