･When the unit price, the quantity, and the tax rate are input, it calculates automatically.
･Total is calculated automatically when adding it to the list.
･It corresponds to the discount.
[explanation of button]
･[Clear]button ･･･ The value under the calculation is returned to 0.
･[add list]button ･･･ It adds it to the list.
･[delete]button ･･･ Details selected by the list are deleted. When the total is selected and the button is pushed, all contents of the list are deleted.
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