Weighted Grade = Each (Course Grade × Credit)
Total Credit = All Course Credits
Average Grade = Total (Weighted Grade) ÷ Total Credit
4 System = (100 Grade × 4) ÷ 100

Letter Grade Correspondences:

AA: 90-100 (4.00)
BA: 85-89 (3.50)
BB: 80-84 (3.00)
CB: 75-79 (2.50)
CC: 70-74 (2.00)
DC: 65-69 (1.50)
DD: 60-64 (1.00)
FF: 0-59 (0.00)