IN order to calculate how much interest will Loki pay when he finishes paying his debt we just have to multiply the number of months by the monthly payment:
Number of months* Monthly payment= Total
12*121=1452
To the total he paid we just withdraw the amount he got loaned:
Total-loan=Interests
1452-1200=252.
So we know he at the end of the loan will have paid 252 dollars in interests.
