How much can I expect to earn being a writer?/What is the salary for a writer?

I have absolutely no idea how much you would earn if you became a writer. You probably could not pick a profession that has a wider range of compensation. Some writers are incredibly rich. Some make a few thousand dollars a year from their writing. There are more of the latter than the former, if that helps. Writers are not “salaried” so the question doesn’t really apply.