Question on RU self reporting GPA

My son’s high school as a grading system that does not use plus grades, only minuses.
95-100, A, 4.0; 90-94, A-, 3.5; 85-89, B, 3.5; 80-84, B-, 2.0; etc.
Does anyone else have a school that uses this format? It seems to me this lowers our students’ GPA. For example, an 84 should be a B, 3.0
When reporting grades for the RU application, does Rutgers calculate the GPA?

Yes, the level of course rigor denoted when students report their class grades allows admissions to make its own GPA calculation.