Percentages are often used to compare

quantities. Like,

*the price of RAM dropped 20% since last year*, and so on.

This is how one would

calculate *percent change* between two numbers:

`|new value - original value|
`

% change = ---------------------------- * 100

original value

### An Example:

Using a

help desk situation, here is how we would find the percent change between

64 calls per day and 28 calls per day:

`|64 - 28|
`

% change = --------- * 100

64
**% change = 56.25%**