(Components of an annuity payment) You take out a 30-year mortgage for $325,000 to buy a new house. What will your monthly payments be if the interest rate on your mortgage is 9 percent? Use a spreadsheet to calculate your answer. Now, calculate the portion of the 36th monthly payment that goes toward interest and principal. Use five decimal places for the monthly interest rate in your calculations. a. Using a spreadsheet to calculate your answer, your monthly payments will be $ 2615. (Round to the nearest cent.) b. The portion of the 36th monthly payment that goes toward interest is $ (Round to the nearest cent.)