Suppose that after buying a new car you decide to sell your old car to a friend. You accept a 270-day note for $3,500 at 10% simple interest as payment. (Both principal and interest are paid at the end of 270 days.) Sixty days later you find that you need the money and sell the note to a third party for $3,550. What annual interest rate will the third party receive for the investment? Express the answer as a percentage, correct to three decimal places.