SOLUTION: If I am getting a 78% in my class and my final is worth 10% of my grade, what do I need to get on the final to get at least an 80%?

Question 874345: If I am getting a 78% in my class and my final is worth 10% of my grade, what do I need to get on the final to get at least an 80%?
Answer by ben720(159) (Show Source): You can put this solution on YOUR website!
The function for an average is:
(sum of terms)/(number of terms)
Because everything else is worth 9 units, compared to 10%,
(9*78+x)/10=80
Multiply both sides by 10
9*78+x=800
702+x=800
Subtract 702 from both sides
x=98

You'll have to get 98% on the final

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