Based on economists' forecasts and analysis, one-year Treasury bill rates and liquidity premiums for the next four ye to be as follows: 2R1E(2Z1)E(3I1)E(4Z1)=0.428=0.788L2=0.078=0.888L3=0.118=1.188L4=0.128 Calculate the yield to maturity for four years. (Round your percentage answers to 2 decimal places. (e.9., 32.16))