Hello everyone!!

The following sequence continues indefinitely:

27 = 3 x 3 x 3

207 = 3 x 3 x 23

2,007 = 3 x 3 x 223

20,007 = 3 x 3 x 2223.......

Which of the following integers is a multiple of 81?

A: 200,007

B:20,000,007

C: 2,000,000,007

D: 200,000,000,007

E: 20,000,000,000,007

I know what the answer is, can someone show me how it is done? And how similar problems are done. Thanks.