Tip on Subtotal Calculator

This is a simple tip calculator that is designed differently from other calculators. The premise is to tip only on subtax and not on the tax. It is simple and easy to use. It is self explanatory in terms of how to use it. If used corrently, this may save you many more dollars than the applications worth. The other feature is the option to add a coupon or discount to the subtax. The discount number will be minused from the subtax but will not affect the tip from the original subtax.

Key Features:
-Tip only on subtax
-Discount feature
-Big numbers to easily see each person's bill
-Allows for a variable amount of tip
-Quick and simple to use
-Simple design
-Get amount to pay in under 10 sec. (using the "next" button in the keyboard)