A raft with dimensions floats partially submerged in the ocean, as shown in the figure.

The density of the ocean water is r. Atmospheric pressure is Patm.

(A) Write an algebraic equation for the water pressure exerted on the bottom of the raft.

(B) Write an algebraic equation for the force the water exerts on the bottom of the raft.

(C) Write an algebraic equation for the amount of mass (M) that can be loaded onto the raft without it sinking.