Question $1$: $(25\%)$ :

In Figure below, the right end of manometer open to atmosphere and $S$ represents the specific gravity. Taking ${}_{\text{w}\text{a}\text{t}\text{e}\text{r}}=9\mathrm{.}81k\frac{N}{m^3},{}_{H{g}_g}=133k\frac{N}{m^3}$

a$)$ If $h=5cm$ what is the pressure at the centre of water pipe $($Point $A).$

b$)$ Conversely, if the pressure at the centre of water pipe increases by $1$kPa, what will be the new $h?$

I need part B to be solved.