Percentage
"Percentage" or "percent" means out of 100
Mathematical sign of percentage is % 
Thus x per cent means x hundredths.
Now it will be written as X%
We can also define X% as a fraction.
so, X% 
= 
X 
100 
Example:
Note: The numerator(15) of the fraction is called "rate per cent".
Operations of Percentage

To represent a percentage as a Fraction.
1. Divide the percentage by 100 or multiply the fraction with 
1 
100 
2. After this just remove the percentage sign (%). 
Example:
After converting 20% into fraction,the result will be 
20 
100 

To represent a fraction as a percentage.
1. Multiply the percentage with 100 
2. After this we have to add the percentage(%) sign. 
Example:
After converting 
40 
into fraction,the result will be 
40% 
100 

To represents one number as a percent of another
Example:
What % of 16 is 24?