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The scale factor is obtained by dividing the length of the sides in the photo by the actual length of the sides.
In this case, the sides of the sandbox in the photo are 4 inches long, while the actual sides of the sandbox are 40 inches long.
So, the scale factor is 4/40 = 0.1.
Therefore, the scale factor that was used to create the printed photo of the sandbox is 0.1.