All fractions can be converted into decimals. Sample problem here.
Percents can be converted into fractions and decimals. This lesson shows how. $$20\mbox{%}=\frac{1}{5}\mbox{ }83.2\mbox{%}=0.832$$
All fractions and decimals can be turned into percentages. $$\frac{1}{4}=25\mbox{% }0.6\,=60\mbox{%}$$