A percent or percentage is derived from Latin for "percent multiplied by a hundred".  In mathematics, a percentage is a number or ratio introduce as a fraction of a hundred.  It is also known by its abbreviations "pct.", "pct" and sometimes "pc".  Percentage is a dimensionless number and pure number which has no unit of measurement. It is often represented using the percent sign (%).

The value of a percentage lies between zero and a hundred and has no mathematical restriction.  Percentages may apply to other values.  
For example - 41% or -67% can be expressed as a percentage change and for comparison.
Before the decimal system existed and in ancient room, calculation were often done in fraction in multiplies of 1/100.
For example, August imposed a tax of 1/100 on all goods sold at auction known as centesima rerum venalium. The calculation with these fraction was considered equal to the calculation of the percentage.

Percentage sign

The word percentage is derived from Latin per centum which means hundred or by the hundred. The notation for percentage is developed by a gradual contraction of the Italian word per santo meaning hundred. the purpose of acronym p. has thoroughly disappeared in modern time. The centos were contracted by two circles separated by a horizontal line, from which the modern "%' symbol is derived.

Calculations

The percentage value is calculated by multiplying the numerical value of the ratio by 100. To calculate percentiles, change both percentages to fractions of a hundred or two decimals and multiply them. When talking about each percentage, it is important to mention that it is relative to the overall that corresponds to 100%.

Up and Down series of percentage

Percentage increase and decrease is calculated by rounding up the difference between the two values and comparing that difference to the initial value, stop the percentage increase calculator on top of the computer and increment a specific percentage of the input number evenly.
Solution for what is 20% of 60 -
Method 1-
=20 percent × 60
=20:100*60
=(20*60) : 100
=1200:100
=1200/100
=12
the outcome of  20 percent of 60 = 12
Method 2 -
question : what is 20 percent of 60?
The answer of percentage is step by step
step 1 -  product value is 60
step 2  assume the unknown value with x
Step 3   acvording to step 1, 60 = 100%
Step 4  x = 20%
Step 5  the outckme of  this equation
60 = 100% (a)
X = 20% (b)
Step 6  now divide equation (a) by equation (b) and equation has the same unit (%), we have
60/x = 100/20
Step 7 again the reciprocal of both sides gives
x/60 = 20/100
x = 12
The final outcome  20% of 60 is 12

Conclusion

The percentage difference between two values is calculated by dividing the absolute value of the difference between two numbers by the average of 200 number multiply the result by 100 with yield of the solution in person rather than decimal form.

What is 20% of 60?