Advertising a Higher Price in Installments

Is it permissible to advertise a product whose cash price is 1000 shekels, or 22 installments of 50 shekels [total 1100 shekels]?

In a sale, it is forbidden for the seller to explain to the buyer that if he pays in cash, he will pay less, and if he pays later, the price will be higher. Many err in this by advertising two prices: a cash price and an installment price, and in such a case, the cash purchase is permitted, and the installment purchase is forbidden.

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