Find the percentage increase in the surface area of a cube by tripling each side.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 800%.
Let the original side length of the cube = x
Surface area of a cube = 6x2
New side length = 3x
New surface area = 6(3x)2 = 54x2
Increase in surface area = 54x2 - 6x2 = 48x2
Percentage increase = (48x2/6x2) × 100 = 800%