The Premier league has agreed to pay $900 million in 25 equal annual payments in damages to referees to settle a lawsuit, with the first payment to occur in one year. In order to fund this liability they have decided to invest in corporate bonds that will pay annual coupons that mature in 20 years with a yield to maturity of 3.28%. Using excel solver, if the corporation agrees to allow the premier league decide its own coupon rate for the new bonds and the league wants the portfolio to be immunized against interest rate risk identify what the coupon rate should be