DIGITAL RECEIPT / card

Paper waste is an international problem.
About 12 millions trees are being used for newspaper, wrapping papers,
calendars, receipts and toilet papers per day. As for the receipts,
it is plenty enough to see the total price and the items perchased.
But, because of the insertion of store information, dates and advertisements,
the length of the receipt is becoming longer.
So, I suggest a brilliant device that can reduce paper waste.
This device calculates the total by itself and shows you various information
in different sizes by digital input.