SOLUTION: I have an 77% in my class, if the final is worth 30%, what grade do I have to make on the final to get an 90+% out of the course?

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Question 818404: I have an 77% in my class, if the final is worth 30%, what grade do I have to make on the final to get an 90+% out of the course?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
77(1 - 0.30) + f(0.30) >= 90
77(0.70) + f(0.30) >= 90
53.9 + f(0.30) >= 90
f(0.30) >= 36.1
f >= 36.1/(0.30)
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f >= 120.333
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you will not get a class grade of 90%, no matter how well you do on the final.
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the best class grade you can get is 83.9%, but only if you get 100% on the final.
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53.9 + 100(0.30) = 83.9
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