Two chambers with the same fluid at their base are separated by a $\backslash (30-\backslash$mathrm$\{$cm$\}\backslash )$ diameter piston whose weight is $25$ N $,$ as shown. Calculate:

$1.$ the pressure in A

a$.2316$ Pa

b$.2589$

c$.-2316$

d$.-2589$

$2.$ the pressure in B

a$.2316$ Pa

b$.2589$

C$.-2316$

d$.-2589$

$3.$ the pressure at the bottom

a$.6513$ kPa

b$.-6513$

c$.7221$

d$.-7221$