Suppose the real risk-free rate is 4.20%, the average expected future inflation rate is 3.10%, and a maturity risk premium of 0.10% per year to maturity applies, i.e., MRP = 0.10 % (t), where t is the years to maturity, hence the pure expectations theory is NOT valid. What rate of return would you expect on a 4-year Treasury security? 07.70% 8.10% 7.90% 07.80% 8.00%