SOLUTION: a student has an 87.31% in Chemistry. The finale exam is 30% of the final grade. What percentage will the student need on the final exam to get a 90% in the class?

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Question 897292: a student has an 87.31% in Chemistry. The finale exam is 30% of the final grade. What percentage will the student need on the final exam to get a 90% in the class?
Found 2 solutions by richwmiller, JulietG:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.7*87.31+.3x=90
x = 96.2767 needed

Answer by JulietG(1812) About Me  (Show Source):
You can put this solution on YOUR website!
His goal is 90%
So far, he has 87.31 * .70, or 61.117 points toward his 90
For the other 30%, he'll need 90-61.117, or 28.883/30
He had better study long and hard -- he must get 96.28 on his final to get a final grade of 90%.