Answer
$150$ square feet
Work Step by Step
The surface area $(S.A.)$ of a cube is given by the formula:
$S.A.=6s^2$
where $s$=length of each side..
The given cube has $s=5$ ft.
Using the formula above gives:
$S.A.=6(5^2)
\\S.A.=6(25)
\\S.A.=150$
Therefore, the surface area of the cube box is $150$ square feet.