Answer:
900% times as big
Step-by-step explanation:
You want the ratio of the volume of Pyramid B, which is 3456 in³, to that of Pyramid A, which is 12 in square and 8 in high, expressed as a percentage.
The volume of Pyramid A is found by ...
[tex]V=\dfrac{1}{3}s^2h\\\\\\V=\dfrac{1}{3}(12\text{ in}^2)(\text{$8$ in})=384\text{ in}^3[/tex]
The volume of Pyramid B is larger by a factor of ...
[tex]\dfrac{\text{Volume B}}{\text{Volume A}}=\dfrac{3456\text{ in}^3}{384\text{ in}^3}=9=9\times100\%=\boxed{900\%}[/tex]