In the 4.0 grading system, each letter grade has the following numerical value

A=4.00 B- = 2.67 D+ = 1.33

A- = 3.67 C+ = 2.33 D = 1.00

B+ = 3.33 C = 2.00 D- 0.67

B = 3.00 C- = 1.67 F = 0.00

use the weighted mean formula to find the grade point average for a student with the following grades.

Mathmatics credit:3 grade: C-

English credits:3 Grade: C

computers credit:2. Grade: A

Biology credit:4. Grade: -A

Art credit: 1. Grade: B