Aluminum foil used to package food is approximately 0.0254 mm thick. Assume that all of unit cells of the aluminum are arranged so that ao (unit cell length) is perpendicular to the foil surface. For a 10 cm x 10 cm square of the foil, determine:
(a) The total number of unit cells in the foil; and
(b) The thickness of the foil in number of unit cell