SOLUTION: If i have a 66.5 grade in my pre calculus class that only counts for 75% of the material covered, what grade do i need to get in my final exam that is worth 25% of my overall grade

Question 380117: If i have a 66.5 grade in my pre calculus class that only counts for 75% of the material covered, what grade do i need to get in my final exam that is worth 25% of my overall grade to pass the class with at least a B? i just dont know how to calculate the percentage of the final(25%).
Answer by kingme18(98) (Show Source): You can put this solution on YOUR website!
Your grade can be calculated as:
Final grade = (current grade)*.75 + (exam grade)*.25
You said "at least a B". I'm going to assume you mean 80% or above.
80 = (66.5)*.75 + (exam grade)*.25
80 = 49.875 + (exam grade)*.25
Subtract 49.875 on both sides
30.125 = (exam grade) * .25
Divide by .25 on both sides to get (exam grade) by itself
120.5 = exam grade
In order to get at least an 80%, you'd need 120.5% on your final exam.
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