A previously issued A2, 15-year industrial bond provides a return one-half higher than the prime interest rate of 10 percent. Previously issued A2 public utility bonds provide a yield of three-eighths of a percentage point higher than previously issued A2 industrial bonds of equal quality. Finally, new issues of A2 public utility bonds pay three-fourths of a percentage point more than previously issued A2 public utility bonds. What should be the interest rate on a newly issued A2 public utility bond?