Arithmetic & Basics
Basic

Percentage Change

Increase or decrease of a value as a percentage.

Formula

%change=new−oldold×100\% \text{change} = \frac{\text{new} - \text{old}}{\text{old}} \times 100

Variables

newNew value
oldOriginal value

Example

From 50 to 60 = +20%

Did You Know?

A 50% drop followed by a 50% rise does NOT return you to the start — you end up 25% below, a trap that fools many investors.

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