This question were asked previously no one read it properly and didnt even thought to see the photo uploaded so ii had to rate them bad and someone even copy and pasted previous uploads so please see the photo uploaded too.

A water treatment plant stores chloride $($assumed density $1560$ kg$/$m$3)$ in a tank with the section shown in figure below. Ignoring the inlet and outlet pipes, there is a gate on the bottom of the tank for services. The width of the gate is $760$ mm$,$ hinged at the bottom of the tank and has a tower bolt, locked on top. Calculate the force exerted on the gate when the tank is filled up to the top. Determine the location of the centre of action $($centre of pressure$)$for this force. How much is the force exerted on the lock? Consider the force on the lock applies at the middle of the top staple $($Point A in the picture$).$ Discuss the situation that the gate is hinged at top and the lock is at the bottom as drawn on figure

$.$ Is the force bigger or smaller in this situation?