Whatever.

随便吧。

Have/Do it your way.

随你吧。

It's your choice/call.

你看着办吧。

Suit yourself.

请自便。

Do whatever you want!

你想怎样就怎样吧!(你开心就好)

I'm cool with it.

我都行!

Yeah, yeah. You're the boss.

行，行~你是老大听你的。

Well, that's it.

那么，就这样吧。