DM: problem of sample size

Though It is a sort of traditional question, I wonder your method to =
deal with this kind of problem.

The population size is about 9,500,000 (as record). There are two =
groups, A and B.
But Unfortunately, the size of A is 9,300,000 and that of B is 200,000.=20

Of course, The size of B is sufficiently enough to make sample or =
analyze, But we have to balance the size of two groups. what is =
appropriate sample size for two groups, What kind of sampling methods =
could be applied?=20

This problem is similar to the case of 1 bad guy and 99 good guys of 100 =
guys.

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