A diver swim horizontally 8 m below the water.What is the pressure on his back?t?

Question

the topic is about the fluid pressure!! pls. help me.
Given:
the density of NaCl is 1025 kg/cu. m. ; atmospheric pressure is 75 cm Hg; dHg= 13 600 kg/m3; and g = 9.8 N/kg.

Answer 1

An 8m column of water will exert a pressure over a 1 m^2 surface of

8 x 1025 kg x 9.8 m/s^2 = 80360 N/m^2 = 80 360 Pa.

The air column pressure is

0.75 m x 13600kg x 9.8m/s^2 = 99 960 Pa

So the total pressure is

80 360Pa + 99 960Pa = 180 320 Pa