I am currently an intern at a software development company, and I have been offered a position as a return intern for the summer. I'm currently a student in a five year undergraduate/graduate plan, and I graduate with my undergraduate degree this May. As such, it is expected to get a salary increase as I become a graduate intern. I was offered a small increase in my hourly wage, from $23 to $25, but others I've known in the past who've gone from undergraduate to graduate have had as much as an increase from $20 to $26. This was three years ago, and the average hourly salary for my position among multiple companies is currently $35.
This leads me to think that maybe I have not been classified as a graduate student intern, but the raise is simply because it's my second year as an intern with the company. How do I ask for clarification on that without seeming like I'm just wanting more money?