Hi, I have three questions when it comes to internship compensation in SDE within California.

1. How is the compensation for an internship usually specified? For instance, per hour or as monthly salary?
2. What is the decent amount (or the bare minimum) that one should ask for in California: a) in Bay area, b) outside of Bay area? I have around 3 years of professional experience in Java. I know that for top companies it's usually non-negotiable, so I'm asking with regards to non-top companies.
3. If the monthly salary equals to, let's say, $1000 for simplicity of calcuations, how can I assess the net value?