Question $4(3$ points$)$

Access plates on the industrial holding tank are bolted shut when the tank is filled with vegetable oil as shown in the diagram below.

Suppose that $h=7\mathrm{.}00m$ and $d=2\mathrm{.}1m$ and the density of the vegetable oil is given by $992k\frac{g}{m^3}.$

Determine the location of the resultant force that this liquid exerts on plate B measured from the bottom of the tank.