SOLUTION: how do i work a reverse percentage...for example, if i multiply .085% by 100, i get 8.5...how do reverse calculate this equation to get back to 100, if i didn't know that 100 was t

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: how do i work a reverse percentage...for example, if i multiply .085% by 100, i get 8.5...how do reverse calculate this equation to get back to 100, if i didn't know that 100 was t      Log On


   

Question 152352: how do i work a reverse percentage...for example, if i multiply .085% by 100, i get 8.5...how do reverse calculate this equation to get back to 100, if i didn't know that 100 was the original number the percentage was calculated from?
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
Any percentage data you have, you always deal with 100.
Before you use given data in percentage(%), you always divide it by 100 for you to use it in the equation.
IN GENERAL, YOU DIVIDE THE GIVEN % BY 100 FOR YOU TO USE IT OR KNOW IT, OR FOR ANYTHING. IN REVERSE, WHEN YOU DIVIDE IT THE FIRST TIME, MULTIPLY IT THIS TIME 100 TO GET ORIGINAL VALUE.
EXAMPLE:
You get 30% out of 50 questions:
Solution:%2830%2F100%29%2A50=0.30%2A50=15
To check (by reversing):
%2815%2F50%29%2A100=0.30%2A100=30%
See, you always go back to 100
Hope this help.
Thank you,
Jojo