Final answer:
To compare the semiannual and monthly payment amounts for Sam's loan, we must adjust the interest rate and calculate based on the period. Monthly payments result in a lower total annual cash outflow because the principal is repaid faster, thereby reducing the interest expense over the course of the year.
Step-by-step explanation:
To calculate the semiannual payments for the loan at 7% interest over 5 years, we need to convert the annual interest rate to a semiannual rate and then calculate the payments based on the number of semiannual periods. For monthly payments, the same process applies, but with a monthly interest rate and more payment periods.
For semiannual payments, the formula for the payment amount R when the loan amount PV is given by:
PV = R * [1 - (1 + i)^-n] / i
where i is the semiannual interest rate and n is the total number of semiannual payment periods. The monthly payment plan would have a smaller i (since it's a monthly rate rather than semiannual), and more periods.
The reason why option (a) is correct is that as more payments are made each year, the principal is repaid faster and the interest expense is lower because interest is calculated on the remaining balance, which decreases with each payment.