If each edge of a cube is increased by 25%, then the percentage increase in its surface area is
a) 56.25%
b) 25%
c) 30%
d) none of the above
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a. 56.25 as the surface area of a cube is 6^s^2=6^s^s
If the length of each edge is increased by 25% then the new one area is 6×(1.25×s)×1.25×s)
which is equal to 56.25
If the length of each edge is increased by 25% then the new one area is 6×(1.25×s)×1.25×s)
which is equal to 56.25
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