To find the surface area of the Rubik's cube, we need to find the area of each side and sum them up.
Each side of the Rubik's cube is made up of 3 by 3 smaller cubes. So, each side has a dimension of 3 inches by 3 inches, giving us an area of 3 inches * 3 inches = 9 inches^2.
Since the Rubik's cube has 6 sides, we need to multiply the area of each side by 6.
Therefore, the surface area of the Rubik's cube is 9 inches^2 * 6 = 54 inches^2.
So, the correct answer is 54 in.2 or 54 in. squared.