# How do you find the percent change given before:90 and after:200?

Nov 30, 2016

The percent change is 122.bar2% or 122.2% rounded to the nearest 10th.

#### Explanation:

Percent change of two values can be determined using the formula:

$p = \frac{N - O}{O} \cdot 100$ where $p$ is the percent change, $N$ is the New Value and $O$ is the Old Value.

We are given the New Value (after = 200) and the Old Value (before = 900) which we can substitute into the formula and calculate the percent change:

$p = \frac{200 - 90}{90} \cdot 100$

$p = \frac{110}{90} \cdot 100$

$p = \frac{11000}{90}$

p = 122.bar2%