FORMULABANK

What Percentage Does a Part Represent?

Example:
How much is 20 out of 200?

Note:

It is incorrect to write:

$\frac{10}{100}·100=10\%$, because: $\frac{10}{100}·100=10$ and: $10\%=0.1$.
Thus, $10=0.1$ is not true. The equals sign "=", means that both sides of the equation must have the same value.