(16 points) Some hypothetical alloy is composed of 12.5wt% of metal A and 87.5wt% of metal B. If the densities of metals A and B are 4.25 and 6.35g/cm3, respectively, whereas their respective atomic weights are 61.5 and 125.7g/mol, determine whether the crystal structure for this alloy is simple cubic, face-centered cubic, or body-centered cubic. Assume a unit cell edge length of 0.395nm, and equivalent weight of alloying from metal A and B