A couple borrows $200,000 for a mortgage that requires fixed monthly payments over 30 consecutive years. The first monthly payment is due in one month. If the interest rate on the mortgage is 5%, which of the following comes closest to the monthly payment? When would the calculation of the effective annual interest rate be most useful?
a. When comparing two investments with different annuity amounts
b. When comparing two investments with different par values
c. When comparing two investments that end at different points in time
d. When comparing two investments that compound differently within a year
e. When comparing two investments that have different inherent risk