"An engineering student bought a car at a local used car lot. Including tax and insurance, the total price was $15,000. He is to pay for the car in 13 equal monthly payments, beginning with the first payment immediately (the first payment is the down payment). Nominal interest on the loan is 12%, compounded monthly. After six payments he decides to sell the car. A buyer agrees to pay off the loan in full and to pay the engineering student $2000. If there are no penalty charges for this early payment of the loan, how much will the car cost the new buyer?"