Is it permissible to annul a sale in which half the price was paid in Syrian Pounds and the other half in US Dollars, and to return the full amount paid in Syrian Pounds, despite the difference in exchange rates?

If the sale is rescinded, the price must be returned in the currency in which the sale was contracted, for the rescission applies to what the contract applies to. However, if the currency's value decreases by one-third or more, the principle is to revert to the value, or to reconcile and share the damage between the two parties. This means considering the currency's value at the time of the contract and what it is worth now, with both parties bearing the difference together. Then, the amount is returned in a different currency to avoid falling into usury.