# How do you calculate percent change if on day 5, a company made £23,000 and on day 7 it only made £2,000?

Oct 16, 2017

See a solution process below:

#### Explanation:

The formula for calculating the percent change in a value between two points in time is:

$p = \frac{N - O}{O} \cdot 100$

Where:

$p$ is the percent change - what we are solving for in this problem.

$N$ is the New Value - £2000 in this problem.

$O$ is the Old Value - £23,000 in this problem.

Substituting and solving for $p$ gives:

p = (£2000 - £23,000)/(£23,000) * 100

p = (-£21,000)/(£23,000) * 100

p = (-£2,100,000)/(£23,000)

$p = - 91.3$ rounded to the nearest tenth.

Between Day 5 and Day 7 there was a 91.3% decrease or a -91.3% change