The ruling on selling paper riyals for metal riyals with an increase

The questioner:
Attracting customers,

The Shaykh:
and he does not give them anything for twenty. He does not give them anything except for a qirsh or a riyal. Yes, that is correct. He is calculating the account. He always has calculations. And the loss falls on the other party, the poor, risk-taking person.

The questioner:
The remainder of the twenty, but it became on the ground until the end.

The Shaykh:
That the increase must be, or the increase? I believe that this is not permissible because it is one type, all Saudi riyals, and the Prophet (peace and blessings be upon him) said, "If these types differ, sell as you wish," and here the type has not differed; the type is one, a riyal, a Saudi riyal for a Saudi riyal, so the increase is not permissible with it? Yes. And the difference in material does not affect this; this is paper and that is metal; the difference in material does not affect it.
The consideration is the name and the value. This is the consideration and the state's recognition. The state considered this a Saudi riyal. And we do not say that this is nickel and this is paper. Because the paper riyal has no value. But by the state's consideration, it is what gives it value. But the metal piece has no value except by the state's consideration.