You are going to make a $70,000 downpayment on a home that costs $450,000 and will borrow the rest via a mortgage. You select the following: Fixed rate of 7.50% semi-annually compounded. Amortization period of 20 years. Monthly payments. 5-year term. Part A (3 marks): Please compute the monthly payments. Part B (3 marks): How would your monthly payments change if you extended your amortization period by 5 years? Part C (3 marks): Comment on one benefit and one cost of extending the amortization period. Hint: think back to the discussion we had about this during class. Part D (3 marks): Consider the original 20-year mortgage and determine how much principal would remain at the end of the 5-year term.