[relativistic]

the first 2 answers will be the same,
the pressure in liquid depends on ,density of liquid and height of theliquid which is the same in both
thus the
p= density *height* 9.8

after calculating the pressure multiply it by 1 ,you will get the force which is the same as pressure.

the second 2 answers are same ,you can add the weight of each container {100*9.8}

to the force you get in the first answer.

hope that i helped you .