Beulah buy a portfolio consisting of a 6 month Zero Coupon Bond with maturity value of $1,000 and a 1-year Zero Coupon Bond with maturity value of $2,000. If she paid $2766.44 for the portfolio then, algebraically find the yield to maturity of the portfolio. Your answer should be correct to 3 places after the decimal point and stated as per annum compound semiannually. Yield_____