Mensuration Practice Test 8

Let the edge of the cube = a
Then volume of the cube = ${\mathit{a}}^3$
New edge of the cube = 3a
New volume of the cube = ${\left(3\mathit{a}\right)}^{34}=$9a^3$
Change in volume = $9{\mathit{a}}^3-{\mathit{a}}^3$ = $8{\mathit{a}}^3$
So, percentage increase = $\frac{8{\mathit{a}}^3}{{\mathit{a}}^3}\times 100$ = 800 %