I have never heard of 80-100 being an A, it has always been either 90-100 or 93-100 everywhere I've ever been/heard of. Then again, the % rarely meant anything in university since every class was curved to a C+ average and the distribution of letters were decided by the professors.
More on topic, I can honestly say that my GPA was never brought up during interviews, and I had several at places you would think only hire students with near perfect GPA. Every single interview I had, however, asked about the extracurricular activities, my senior thesis, and the work experience that I had listed. It is a little late to do that now for this interview, but seeing as you still have not graduated, I would definitely join a extracurricular that is within your area of study. Also, if you have the option, do a senior thesis project. Those two things will get your foot in the door of many places that would normally reject you due to your GPA.