vb.net - How to calcualte GPA for each group in Crystal Report? -


i have develop report show student's current semester grade, credit each course , student details. , total gpa each student on semester. this, have created group depending on student id. report shows ok have calculate gpa each student id each group in crystal report. formula gpa is:

 (grade point * credit)/sum(credit)

i not sure how can apply formula in each group footer. can me on please?

mentioned: using crystal report 10, vb.net, mysql

//{@gpa} sum({table.grade_point},{table.student_id}) / sum({table.credit},{table.student_id}) / sum({table.credit},{table.student_id})

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