90% is an A, 80% a B, 70% C, 67% C-/P, 60% D, 0-59% F/N.
As stated on the syllabus: Projects are equally weighted and comprise 30% of your grade; the two exams are equally weighted and comprise 70% of your grade; your grade is based on weighted items, not total points; the course uses a straight percentage, rather than a curve.
The formula to compute your weighted percentage for the course is:
Wtd% = (0.3 * YourProjPts/500 + 0.7 * YourExamPts/300)