My portfolio has an Australian treasury bond: first issue date (18 Jun 2011) and maturity date (21 May 2023), the coupon rate of 5.5% per annum paid semi-annually, face value is 1000$, the market interest rate is 5.5%. Find the yield to maturity, find the bond's price today, the bond price after 2 years from now, find the annual return for the portfolio.

write the formula and explain clearly