A tank with vertical sides is square in plane with 3m long sides.The tank contains oil of relative density 0.9 to a depth of 2.0m which is floating on water a depth of 1.5m.Calculate the force on the walls.(Consider one wall of the tank).

Question

$\begin{array}{1 1}(A)\;791461N\\(B)\;153.4N\\(C)\;141N\\(D)\;165544N\end{array}$