1. Isabella wants to buy a $285,000 house, and her bank offers her a mortgage with an interest rate of 8.5% compounded semi-annually. She will put a down payment of 15%, and the mortgage will be amortized over the next 30 years. If payments are going to occur at the end of each month:

   a) How much is Isabella going to pay each month? b) How much will Isabella still owe the bank after 12 years? b) How much interest will Isabella pay during the first 18 years?