SOLUTION: if I have an 80% in my math class, and the final is worth 25% of my grade. what do I need to get on the final to keep my grade at a B?

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Question 932195: if I have an 80% in my math class, and the final is worth 25% of my grade. what do I need to get on the final to keep my grade at a B?
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
assume that B is 80% to 90% inclusive:
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75*80 + 25x = 100*80
25x = 100*80 - 75*80
x = ( 100*80 - 75*80 ) / 25
x = 80
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answer:
you need 80% or better on the final
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