Consider a bond at par initially issued for a 30-year term. Its nominal rate (annual coupon) is 5%. You buy this bond when it still has 20 years of residual maturity. At that time, the market rate is 8%. A few days after your purchase, the market rate drops to 6% (this assumption is then always verified). You will sell your bond 12 years later (8 years before maturity). What will have been the overall annual profitability of your investment?