How does Duke University's grading scale work?

Yo guys, I've read that Duke has some kind of unique grading system, and I'm curious about how it works. For those of you who are familiar, could you break down the grading scale at Duke for me?

Duke University follows a +/- grading scale, but with a unique twist. The key difference is that there is no A+ grade, and the highest GPA value you can get for a class is a4.0.Here's a more detailed breakdown of the Duke grading scale:- A (4.0): Exceptional, outstanding work- A- (3.7): Nearly exceptional- B+ (3.3): Very good, solid, above average- B (3.0): Good, satisfying, average- B- (2.7): Almost good- C+ (2.3): Okay, but below average- C (2.0): Slightly unsatisfactory- C- (1.7): Unsatisfactory- D (1.0): Very unsatisfactory- F (0.0): FailureNote that instructors at Duke are not obligated to use the +/- system, and some might only use A/B/C/D/F.

The GPA is calculated as an average of your class grades where each class grade is weighted by the number of credit hours for that class. For example, if you get an A (4.0) in a3-credit class and a B (3.0) in a4-credit class, your GPA would be [(4.0 3) + (3.0 4)] / (3 +4) =3.43.Understanding how grading works at your prospective institution is crucial, so kudos to you for doing your due diligence!