Need help with Risk Free Rate in excel

IL Text Query All P Edit Links Advanced Colum X v fx A B C D E geometric annualized annualized std annualized 9 Asset Portfolio E (r ) Weight S&P 500 9.64 Costco .15.78 Exxon -24.44 0 JPMC 9.3 0.16179147 CVS -10.58 O Equifax 5.4 0 Apple 29.29 0.11469915 Walt Disney 1.32 0 PPL -4.16 0 Amazon 37.32 0.72350939 Welltower -22.76 0 Dupont -12.53 0 Total Portfolio E (r ) 31.865569 Formula Portfolio Variance 0.00331129 P(r )= w1*xr+w2*x2 Portfolio Standard Deviation 0.05754379 o' wa*o'atw'b*o'b+2WaWboab Sharpe Ratio 553.762059 0 30 40.5 Risk Free Rate P(r )-R(f)/op * Efficient Portfolio constructed using Excel Solver Sheet1 5v Opitimal Portfolio 5v Lowest Dial Daritalia Covariance Matrix