$\begin{array}{1 1}(A)\;826Kg/m^3\\(B)\;774Kg/m^3\\(C)\;878Kg/m^3\\(D)\;\text{None of above}\end{array} $

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As density =$\large\frac{\text{mass}}{\text{volume}}$

$S=\large\frac{M}{V}$

$\large\frac{\Delta S}{S}=-\frac{\Delta V}{V}$

As pressure increase,volume decrease and density of material increases

We know $\large\frac{\Delta V}{V}=\frac{\rho}{B}$

$\Rightarrow \large\frac{3\times 10^8}{9\times 10^9}$

$\Rightarrow \large\frac{1}{3}$$\times 10^{-1}$

$\large\frac{\Delta S}{S}=\frac{1}{3}$$\times 10^{-1}$

$\Delta S=\large\frac{80}{3}$$=26.67Kg/m^3$

$S_{Final}=800+26.67$

$\Rightarrow 826.67Kg/m^3$

Hence (A) is the correct answer.

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