Me and my study group have been developing a system for a company the last semester, but the system isn't done at the end of the semester (which is fine) and the company have mentioned that they want to pay us to finish the system.
The problem is that we have a very little knowledge about how much time it is going to take.
So what are we gonna say? It's pretty hard to calculate a price and estimate any time frame

Which programs/IDE do you use for Android development on Linux?

I am using a 2012 MacBook pro now, but I am thinking about switching to Linux (Ubuntu) or Windows before university. What do you recommend?