How does grading actually work?

[Lingo55]

I've recently completed my third class this semester and received my grading feedback, and for the first time I haven't scored all "4's" in every category. I would assume based on the grading scale that scoring "exemplary" in every category would be a 100%, or a 1.0 according to the "competencies with project based final assessments portion of the rubric. 

For example, in my most recent class, there were 7 categories. For my grade, I scored "exemplary", or a "4" in 6 categories, and "proficient" in 1 category. Would the grading potentially look like: 

7x4 = 28 total points possible
My score, 6x4 = 24 + 3x1 = 27
So, 27/28, or 0.96.4 on the grading scale indicating an "A" instead of an A+? 

If so, does this mean that an A (not an A+) is a 3.7, or a 4.0? 


If someone has an answer to this, I would sure appreciate it.

In the meantime, thanks for everyone on the forum's help in guiding me to UMPI. It's been amazing so far.