How does menjadi connect to jadi = so ?
I don't think it does
is "they do not become rich" also correct?
I would say so, too
They have not become rich is the correct present tense translation. They did not .... is past tense!
I might be wrong but I believe in Indonesian there isn't much difference between the tenses? it could be either present or past, I think it depends on context.
They have not become rich should be correct too.
Just for fun, I put "They will not become rich", but this was marked wrong. Is it actually wrong?
I think that would require "akan" or some other helper word right?
Google translate seems to agree with you, DanielCark, but I was under the impression Indonesian did not have tenses. Thanks.