Test Preparation on Solid State-II-Chemistry Test Series For NEET-2020

A metal has a fcc lattice. The edge length of the unit cell is
404 pm. The density of the metal is 2.72 g cm^-3 . The molar mass
of the metal is
(a) 20g mol^-1    (b) 40g mol^-1
(c) 30g mol^-1    (d) 28g mol^-1

A given metal crystallizes out with a cubic structure having
edge length of 361 pm. If there are four metal atoms in one unit
cell, what is the radius of one atom