Recently, Amy Estes was interested in purchasing a Honda Acura. The salesperson indicated that the price of the car was either $26,000 cash or $6,500 at the end of each of 5 years. Compute the effective-interest rate to the nearest percent that Amy would pay if she chooses to make the five annual payments. (Round answer to 0 decimal places, e.g. 7%.)

Interest rate? %