SOLUTION: if I have a 90 percent average what do I need to get on my final to finish with an 80 percent when the final is worth 20% of the final grade?

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Question 933154: if I have a 90 percent average what do I need to get on my final to finish with an 80 percent when the final is worth 20% of the final grade?
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
x= percentage points on the final
Weighted Average=0.80%2A90%2B0.20x=80--->72%2B0.2x=80--->0.2x=80-72--->0.2x=8--->x=8%2F0.2--->x=40
If you score 40% in a final worth 20% of the grade,
and the weighted average of the rest of your grades is 90%,
you will end up with a final grade of 80%.