Posted by Carrie on .
Lindsey has 75% as her final grade, but after she writes her exam she gets 85%.
If her exam is worth 7.5%, what is her final grade.

Problem Solving 
Ms. Sue,
Multiply 75 by 0.925.
Multiply 85 by 0.075.
Add the two products together to get her final grade. 
Problem Solving 
Salina,
Don't you take 75x0.075= 6.375
then add that to her final grade of 75% to get 81.375? 
Problem Solving 
Ms. Sue,
No, that's not correct.
75% is an average of all of the work that she did during the semester. 
Problem Solving 
Carrie,
Thanks but,I don't understand, because
75x0.925= 69.375
85x0.075= 6.375
69.375 + 6.375= 75
How can that be right? Where did you get 0.925 from. Isn't her final grade going to go up after her 85% on the exam. 
Problem Solving 
Ms. Sue,
I got the 0.925 by subtracting 0.075 from 1.
By my calculations, the grade only goes up from 75 to 75.75. Rounded to the nearest percent = 75.75 = 76. A final grade of 76% makes sense because the exam is only a small part of the final grade.