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If the pressure is calculated ignoring the change of density the pressure is 1.10*10^8 pa

I have to calculate the water density at the bottom using the compressibility and the actual pressure.

Since k= - Delta V/Vo*DeltaP

DeltaP*k= - DeltaV/Vo and V=m/rho

DeltaP*k=-(rho1-rho2)/rho2 where rho1 and rho2 are the water density at the surface and at the bottom respectively.

I end up with:

rho2=-rho1/(DeltaP*k -1)

From this I get rho2 as 1033 pa but I should get 1080 pa

Could someone please give me a hint to what I am doing wrong?

Thanks.