To find percentages you need to remember that a percentage of anything is an expression of it's relationship to 100 - expressed as as a fraction.

In basic terms a percentage is the numerator, or top part, of a fraction, whose denominator, or bottom part, is 100.

So...

...for example, 50 / 100 = 0.50, or, 50%. From this simple example we can see that, if we wanted to find 50% of 100, we simply move the decimal place two places to the left, then multiply by 100.

The process is:

First you need to find the value of 1% of a given number by dividing by 100, or simply moving the decimal place two places to the left.

To get to the required percentage, multiply the required value by the calculated 1%.

In the case of the question - What is 20% off 80.

1% of 80 is 0.8, or 80 / 100

Now multiply this by 20 and we get 0.8 x 20 = 16 - or 20% of 80.

So 80 - 16 = 64

To find 20 percent off 80.00, you first have to find 20% of 80 and then subtract that amount from 80.

20% of 80 can be found by changing the 20% to a decimal or a fraction. 20% as a decimal is .20 and 20% as a fraction is 1/5 (20/100 and then reduced to lowest terms).

80 times .20 or times 1/5 equals 16. That is how much 20% of 80 is equal to. Now to find what 20% off 80 is equal to, we substract 16 from 80 to get 64.

The answer to your question is 64.

20% of 80 is 16.

The calculation for figuring this percentages is as follows:

1) X/80 = 20%/100% - the unknown number over 80 equals 20% over 100%

2) X * 100 = 80 * 20 - multiply the unknown number by 100 and 80 by 20

3) X100=1600

4) X100/100 = 1600/100 - then divide both by 100, this will give you the unknown figure.

5) X=16

80 / 100 = 0.8

Dividing by 100 gives 1%. Therefore multiply 0.8 by 20 to get 20%.

Answer is 16