car dealer

Q: I am a car dealer. I am not involved in finance. However, I accept different forms of payment, such as cash, EFT and via a card machine. Is it permissible for me to decide the price of a vehicle depending on the customer’s form of payment? The bank charges me 3,25% (for a credit card) and 1,75% (for a debit card) of the total amount if the card machine is used. Can I add this percentage onto the original price of the vehicle? If so, does it have to be the exact amount the bank charges me or can I round off or add to the amount as I desire?

Q: I want to sell my car and I know that in most cases, people will not be able to buy it cash. I know a car dealer who arranges finance from the bank for customers. Can I advertise the car and say that finance can be arranged, and when a customer comes to me, I will send him to the car dealer who I know will assist him with the finance? Will this be permissible?