What is the ruling on adding a profit margin when selling goods on installment that decrease in value over time, such as electrical appliances and cars?

It is permissible to increase the price of an item sold in installments compared to its cash price, because deferment has a share in the price. There is no difference between an item whose price is expected to rise in the future and one whose price is not. The transaction mentioned is Murabaha, and it is permissible if its Sharia conditions are met. Selling gold in installments is not permissible according to the majority of scholars.