Question 962892
If s represents the length of a side of the original crate,
the external surface area of the box is 5 times
the area of squares with length s or
5(s*s).
If the length of a side is reduced by 7%,
the surface area of the new crate is
5((s-7% of s)(s-7% of s)) =
5(0.93s)(0.93s)
= 5(0.8649 s*s)
This means that (1 - 0.8649) = 0.1351 = 13.51 % reduction in surface area.