how to say "i don't care" in German ?

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Answer

Hi. In addition to the above suggestions, I have found the following webpages for your references: 
1) en.wiktionary.org/wiki/nicht_die_Bohne 
2) www.wordreference.com/ende/care 
3) forum.wordreference.com/showthread.php?t=1297907 
4) dict.leo.org/ende? search=don't+care (be sure to delete the space after the question mark when pasting on address bar) 

I also remember a phrase of "sich(Dat) keine Sorgen machen". However, I do not know if this actually means "not to worry" rather than "not to care". 

Anyway, take care. / Mach's gut!

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Auch je nach dem Zusammenhang:

- Es geht mich nicht an
- Es kümmert mich nicht.
- Es ist mir gleichgültig.

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"Das ist mir egal."
(Das) "Ist mir egal."
"Egal!"

"Na und?" = So what?

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I don´t care. = Ist mir egal. = 난 상관 없어.