Sally wants to buy a Ford Mustang. The MSRP is $35,000. Ford offers a purchase financing plan with no money down and 48 end-of-month payments of $800. Should she buy the car for cash or take Ford's purchase financing? Assume that she has the cash and could invest it to earn 5%. Calculate the present value of each alternative and enter your answer as the PV of the cash purchase minus the PV of the financing.