(Right click on video to fullscreen option)

**Our first formula “Hello world!”**

Let’s assume that the option “Width” is assigned with option id {13} and “Height” with {14}

$FinalPrice = {13} * {14} * $Price;

**Now don’t forget to activate the formula!**

When you add a new product or when you install CFO: **all products have their formulas deactivated!**

**Formula Debugger**

Take a look when you push “Add to cart” button and see the Formula Debugger.

**Formula Editor**

CFO will show you a colored Editor which will help you to write and read your formulas, this editor is available in product form when editing a product

**And the simplest and pretty absurd formula**

You will learn more about $Price and other variables in next step

$FinalPrice = $Price;