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?
:
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 = {{{((7(90)+3(20)))/10}}}
a = {{{((630+60))/10}}}
a = {{{690/10}}}
a = 69% would be her average after this disastrous test