You wish to buy a car at a cost of $20,000. Ford Credit will finance the car at 1.9/year over 48 months OR you can receive a rebate of $900 and finance through your credit union at 8.50%, over 48 months; How should you finance the car, and what are your monthly payments? How much of a rebate would Ford have to give to make you indifferent to the financing? How to work on Financial calculator