買い物電卓 tax discount calculator

How much is the contents of your shopping basket?
How much is the 30%OFF of 1280 $?
It's a simple application recommended for people
who are not good at calculations.

---function---
· Enter the price of the item in the shopping
  cart and display it on the list. 
  I understand the total amount and the tax
  included amount.
· For discounted products, enter the original price
  and discount rate and display the discounted price.
  You can understand how much money it is.
· The discounted price can be added to the total
  amount with one click.

It's so simple that anyone can use it easily.

If there is a problem, demand etc, thank you.