SOLUTION: Susan currently has a 90% in math class right now. She's about to take a math final worth 30% of her grade. If Susan gets a 20% on her final, what will her overall average in the c

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Question 1009782: Susan currently has a 90% in math class right now. She's about to take a math final worth 30% of her grade. If Susan gets a 20% on her final, what will her overall average in the class be?
thank you in advanced:)
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Susan currently has a 90% in math class right now.
She's about to take a math final worth 30% of her grade.
If Susan gets a 20% on her final, what will her overall average in the class be?
:
let a = her overall average
:
The final is worth 30% or 3/10 of her grade and class av is 7/10, so we can write an equation
a = %28%287%2890%29%2B3%2820%29%29%29%2F10
a = %28%28630%2B60%29%29%2F10
a = 690%2F10
a = 69% would be her average after this disastrous test