SOLUTION: In a certain class, if Laura's average rose from 84 to 96, by what percent did her average increase? A) 12% B) 12 1/2% C) 14 2/7% D) 16 2/3 % E) 85 5/&% Thank you!

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: In a certain class, if Laura's average rose from 84 to 96, by what percent did her average increase? A) 12% B) 12 1/2% C) 14 2/7% D) 16 2/3 % E) 85 5/&% Thank you!      Log On


   

Question 467380: In a certain class, if Laura's average rose from 84 to 96, by what percent did her average increase?
A) 12%
B) 12 1/2%
C) 14 2/7%
D) 16 2/3 %
E) 85 5/&%
Thank you!
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
They are asking:
"What is ( 2nd average - 1st average ) / 1st average
+%2896+-+84%29+%2F+84+=+12%2F84+
+12%2F84+=+3%2F21+
+3%2F21+=+1%2F7+
+1%2F7+=+x%2F100+
+x+=+100%2F7+
+x+=+14+%2B+2%2F7+
The answer is (C)