Question

Seawater has a density of about 1024 kg/m^3. In fresh water, the water line on a certain rectangular raft (8.8cm thick) moves 3.2 cm when a load of cargo is placed on it. How much will the same load of cargo move the water line in seawater? What is the pressure in fresh water at a depth of 162.5 m? (Don't forget to include air pressure) What would the depth be for that same pressure in seawater?