Suppose a couple, for purchasing a house, made a 300,000 dollar mortgage that repaid at the end of each month for 25 years at an annual effective rate of 5.5%. The couple sell the house at the price of 400,000 at the end of the fifth year, that is , after their 60th payment of the mortgage. The outstanding balance is deducted from the amount that the couple received (deducted form 400,000). Then how much of the 400,000 dollars will return to the couple and how much interests did the couple paid for the mortgage