It is a very convenient calculator for grocery shopping. [As Discount Calculator] Calculation such as "5% discount" and "10% discount" can be done with one touch. It is very helpful at shopping time. If you push the Discount button continuously, you can also calculate 5% discount etc. from 10% discount. [Tax incl calculation] Entering numbers on Shopping Calculator will quickly calculate and display the sales tax inclusive price. By the way, there are five tax rate buttons in the tax rate inp