Grade | Grade Point Value
------- | ---------------
A | 4.0
B | 3.0
Given that you got an A (4.0) and three Bs (3.0 each), we can calculate your GPA as follows:
GPA = (Number of credit hours x Grade point value) / Total number of credit hours
Assuming each course is worth 3 credit hours:
GPA = (1 x 4.0 + 3 x 3.0) / 4
GPA = (4.0 + 9.0) / 4
GPA = 13.0 / 4
GPA = 3.25
Therefore, if you got an A and three Bs, your GPA would be 3.25.