Price Tax Calculator
This mode will add one extra field with price option.
With this module tax-free price calculation will be really easy!
You need to enter just one price and click Calculate button to do all your calculations automatically .

Installing this extension
In order to upload an extension, navigate to Extensions -> Extension Installer. Then click the blue Upload button and provide the route to your extension' s"*.ocmod.zip" archive.
After you verify that the upload is successful you need to navigate to Extension > Modifications and click the refresh button.