Need help on a problem

A block with a density of 545 kg/m$$^{3}$$ and a volume of 0.645 m$$^{3}$$ is held completely under water by means of a rope. Determine the magnitude of the force of the cord on the block.

Relevant Equations
F$$_{}buotant$$ = $$\rho$$$$_{}fluid$$V$$_{}submerged$$

I had no idea how to even solve or approach this problem. Much thanks appreciated!