Tip Calculator including Sale and Tax Calc for iOS

I wanted this app to be *really* easy to use. Thats why it might look simple!Don't know how much to tip?Are you running your own business? Just add the price and you can either add or subtract the tax/tip/discount from it. Just swipe from right to left to see the menu (or tap the settings button). Tap the percentage button and enter a new value. Really easy to use Tip Calculator Calculates Sales Taxes Discounts Sale Price Reverse price calculationsLet me know what you think. I'll update it if I really missed something important.