Question

What is the percent change of 120 to 90?

Answer 1

The percent change is `25.`

Explanation:

Explaining this, it's just to make a proportion like this:
`120 / 90 = x/100`

`120 rarr 125%`
`90 rarr 100%`
`125%-100%= 25%`

You can check this by doing

`90 xx 1.25` (the `1` comes from `100%` or one whole and `0.25` comes from `25%`), and you will get `120.`

There are also websites you can use for this like http://www.percent-change.com/ or https://www.calculatorsoup.com/calculators/algebra/percent-change-calculator.php

Answer 2

`25%` decrease

Explanation:

To calculate a percent increase or decrease, using the method:

`"amount of change"/"original amount" xx 100%`

In this case the change was from `120 to 90` which is `30`

`30/120 xx 100%`

`=25%` decrease