80 should be a B. 76 should be a C. In what college class would an 80 be an A? That is what really doesn't make sense. If you got an A for an 80 which is barely a B to be quite honest, I'd take the grade and run. This is college. Numbers don't matter in the scheme of things. Letter grades represent a range of scores. That's the way it has been. Where that range shifts is where the letter grade changes. Thus, an 80 is usually a B and a 79 is a C. Give it up. You got a gift with an A for an 80.