ently sell for $1,572.72. They have a 16-year maturity, an annual coupon of $85, and a par _083. They have a 4.35% annual coupon rate and a 20-year maturity, but they can be ca call and refund the bonds, and also assume that the yield curve is horizontal, with rate should an investor expect to earn if he or she purchases these bonds? ently sell for $1,572.72. They have a 16-year maturity, an annual coupon of $85, and a par _083. They have a 4.35% annual coupon rate and a 20-year maturity, but they can be ca call and refund the bonds, and also assume that the yield curve is horizontal, with rate should an investor expect to earn if he or she purchases these bonds