SOLUTION: I have to solve a kind of word problem. this is exactly what is says: Sahar began work on a 52 KB text file at noon. By dinnertime, the file had increased to 472 KB. What was th

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Question 34329: I have to solve a kind of word problem. this is exactly what is says:
Sahar began work on a 52 KB text file at noon. By dinnertime, the file had increased to 472 KB. What was the percent of increase in her file? round to the nearest percent.
A 111%
B 89%
C 808%
D 420%
THE TEACHER SAID THAT THE ANSWER WAS C BUT I REALLY DON'T UNDERSTAND HOW HE GOT THAT ANSWER. I HOPE YOU CAN HELP. (I'M IN 7TH GRADE)
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
from 52 to 472 is an actual increase of 420.

Percentage-wise, we ALWAYS use the ORIGINAL. Here, the original file size was 52. So fractional increase is 420/52

Therefore, the percentage increase is (420/52)*100 --> 807.69%
--> 808%... answer C

jon.