VAT is a consumption tax that's usually added to a product's sale price. Simple VAT Calculator is an easy-to-use application that enables you to run calculations which add and remove VAT at your choice and immediately provides you with the results you require.
The main window of the program is very intuitive, so even Mac users with little computer experience can handle it. You simply select the preferred VAT value, enter the product's price, and let the application make the calculations.
From the Settings window you can edit the default VAT values. You don't need to enter the % icon, just write the type of the preferred numbers and click the Done button.
However, a simple Google search within your default browser can find various online VAT calculators. Those tools provide you with the option to select your own VAT value similar to Simple VAT Calculator.
Hence, I'd say it doesn't worth downloading this program if you don't wish to install a third-party application on your Mac because it can produce the same results that online VAT calculators can offer you.