A house is for sale for $360,000. You have a choice of two 25-year mortgage loans with monthly payments: (1) if you make a down payment of 10%, you can obtain a loan with a 6% rate of interest or (2) if you make a down payment of 20%, you can obtain a loan with a 5% rate of interest. What is the effective annual rate of interest on the additional 10% of house value borrowed on the first loan?