Answer:
Step-by-step explanation:
First, find the future value of the annuity payments. You can solve this using a Financial calculator. I'm using TI BA II Plus calc.
N= 12
I/Y = 20% /12 = 1.667% ,monthly rate in this case
PMT=166.74
PV =0
then CPT FV = 2,194.876
To calculate the interest paid over the life of the loan, subtract the amount borrowed from this FV amount;
=2,194.876 - 1,800
Interest = $394.876