Percent

The use of percentages is a way of expressing Ratios in terms of whole numbers. Given a Ratio or Fraction, it is converted to a percentage by multiplying by 100 and appending a ``percentage sign'' %. For example, if an investment grows from a number $P=13.00$ to a number $A=22.50$, then $A$ is $22.50/13.00=1.7308$ times as much as $P$, or 173.08%, and the investment has grown by 73.08%.

See also Percentage Error, Permil