One fifth. 1/5.
http://wiki.answers.com/Q/What_is_20_percent_in_fr...

To change a fraction into a percent, you must use divide the denominator by the numerator. The resulting number is the percentage to your fraction.
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1. Drop the percent sign and write out the percent numerically. For example, write out 75 percent as 75. 2. Divide the percent by 100. For example, 75 percent becomes 75/100. 3. Simplify
http://www.ehow.com/how_4556663_convertpercentsf...

To find what percent 10% of 20% is, just set it up as a
http://www.chacha.com/question/whatis10percent...
