A big spherical besan ladoo of radius 810 cm is broken into smaller spherical laddoos of radius 90 cm. Find the ratio of the total surface area of all the small laddoos taken together to the surface area of the big laddoo.
1
1 ∶ 9
2
8 ∶ 3
3
9 ∶ 1
4
2 ∶ 7