What is the ruling on selling a commodity for two different prices, one prompt (200 Riyals) and the other deferred (250 Riyals)?

It is permissible for the seller to set two prices for a commodity: one for cash sale (200 riyals) and another for installment sale at a higher price (250 riyals), provided that one of the two prices is definitively agreed upon at the time of concluding the contract. However, if the contract is made with hesitation between cash sale and installment sale, it is considered "two sales in one sale," which is prohibited by Sharia and renders the contract invalid.