List Calculator

Now you only need to enter a number, the total

* Surprising and convenient input
- Price entered as two of the keyboard
- Addition, subtraction, multiplication, division, = no input required.
- Automatic calculation of the total units
- Automatic calculation of the total sum

* Convenience features
- The existing calculation stores
- Delete line
- Delete Page
- Support output according to the currency (1,000, 100.34)