At least for the EMV standard the card definitely knows the transaction amount; it's one of the core fields of the transaction that's signed by the chip on the card iff it meets the restrictions configured in it.
Of course, the issuing bank may charge some extra fee on top afterwards, but the amount that the chip card sees and signs should be the exact same number that the POS system would print onto a receipt as the transaction amount.
Of course, the issuing bank may charge some extra fee on top afterwards, but the amount that the chip card sees and signs should be the exact same number that the POS system would print onto a receipt as the transaction amount.