Do you know about Poisson's ratio?

A solid copper cyinder of length $50 \text{ cm}$ is placed b a horizontal surface and subjected to a vertical compressive force of $1200 \text{ N}$ directed downwards and distributed uniformly over the end face. If the resulting change of the volume of th cylinder is $1.5 \times 10^{-3} \text{ mm}^3$ . Find the Poisson's ratio of copper.

Details and assumption

Young's modulus of copper is $120 \times 10^{9} \text{ N/m}^2$