If  each side of a cube is tripled , then the percentage change in the surface area is:

600% 700% 800% 900%

800%

Surface area of cube = 6a2 After triipling each side of the cube new surface area = 6 (3a)2                             = 6 (9a2)                             = 9 (actual surface area) Surface area ⇒ Old : New = 1 :  9 Increased percentage = \(\frac{8}{1}\) × 100 = 800%