A block of wood floats in water with $\large\frac{4}{5}$ th of its volume submerged , but it just floats in a liquid . What is the density of the liquid ?

Question

$\begin{array}{1 1} 750\;kg m^{-3} \\ 800 \;kg\;m^{-3} \\ 1000\;kg m^{-3} \\ 1250\;kg m^{-3} \end{array} $