Answer:
$12,000
Step-by-step explanation:
The reason is that the 10% of the amount $120,000 is $12,000 which is the rate of return which the Montana Furniture Mart has earned due to the sales of the furniture, so the amount that must be debited as interest income at the end of year would be:
Dr Interest Income $12000
Cr Cash or Bank Accout $12,000