PLEASE ANSWER A.S.A.P
Priceless Portrait Studio signed a note with a face value of $48, 000 that requires 24 monthly payments of $2,900. The studio's owner would like to pay the debt in full after 21 months, when there are 3 payments remaining. Find the amount of unearned interest using the Rule of 78.
$490
$432
$561
$252