Sale has ended but you can still get this app.
Download Shopping and Tip Calculator Now

Official Description

Very simple calculator that lets the user enter the tax, purchase amount, and discount, if applicable, and reveals the total to you.
Built in Calculator for purchase amounts.
Tip Calculator app now included
Average Tax rates for each State.
Absolutely no ads.
Straight to the point. No unneeded extras.
Now you can save your purcashes
either go directly to your saved purchases or input the total after you find out what it is
*once you find out just push save purchase and it transfer sover