GPA question

[nameht]

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Hi,

I just had a couple questions regarding GPA calculation

If I failed a prereq class and retook it, how does that factor into my GPA? are the two grades averaged?

and if I got a B in a prereq class (such as introductory biology) and took a higher level biology class:
1) how can i make sure the two classes are equivalent?
2) how would i go about calculating my GPA? just take the grade of the higher level class?

thanks