Answer:
Average monthly interest = $ 122.04
% total interest =36.94 %
Explanation:
There are 120 cumulative payments and the total interest paid was $ 14,644.95.
Hence, the average monthly interest is :
Average monthly interest = $ 14,644.95 / 120
Average monthly interest = $ 122.04
% total interest
= ($ 14,644.95) / $ 39,644.95 x 100
% total interest =36.94 %