Answer:
The correct option is b. The total amount paid by Mari is 16602.12.
Explanation:
The principal amount is $15000, rate of interest is 6.71% and the number of months is 36.
The formula for monthly installment is

Where, P is principal amount, r is rat of interest, t is number of years.
Mari monthly installment is


Her monthly installment is $461.17. Since the lifetime of the loan was 36 months, therefore the total amount paid by Mari is

Therefore the correct option is b. The total amount paid by Mari is 16602.12.