Archimedes' Principle & Floatation question from JEE Main 2026 (2 Apr, Shift 1)

A tub is filled with water and a wooden cube $10$ cm $\times 10$ cm $\times 10$ cm is placed in the water. The wooden cube is found to float on the water with a part of it submerged in water. When a metal coin is placed on the wooden cube, the submerged part is increased by $3.87$ cm. The mass of the metal coin is ________ gram.

(Take water density as $1$ g/cm$^{3}$ and density of wood as $0.4$ g/cm$^{3}$)