Run the "Customize Shortcut..." option in settings to set the default tax rate for your location.
The following menu let's you calculate total cost on a single dollar amount or on an itemized list of items.
The following allows you to apply a discount as a percentage or as a set dollar amount if applicable.
The following sets the tax rate and does all of the cost calculations.
The following displays the results of the calculation and allows you to share the output.