<human>: Condense the text into a few key points

Hey job seekers and job havers!

I posted here a few weeks ago about wanting to apply for my supervisor's job because he was leaving.  I did and I interviewed today and was given the job! Woohoo!

In my current position (keep in mind this is a network of non-profit clinics in Nashville, TN) I make $16.93/hour. I have a BSW (undergrad social work degree) and am bilingual. Without overtime, I make $34k before taxes, but with overtime I made $40k in 2014.  

They offered me the supervisor position at a salary of $42k. I'm currently in school for my MSW (Masters in social work) and while I lack some supervisory experience, I'd like to counter with $48k. My supervisor was making slightly more than $50k so I feel like $48k is okay. Does that sound unreasonable considering I was given essentially a $3.84/hr raise?
<bot>: Can I ask for more money moving into a supervisory role after being given a ~23% raise, but am moving to salary?