Mortgage loan $68,000 have effective rate 31% ( borrower have to pay $3,285.09 per month for 30 years to cover all amount of this loan )

In this case borrower have to pay interest based on condition that effective interest rate 31% compound only once a year to lender every months, means that borrower have to pay 12 months per year, but the interest compound only once a year.

Does the effective interest rate per year is equal to nominal interrest rate per year in this case (31%), I don't cleary understand,please give deeply explaination, and what's the difference among nominal interest rate, effective interest rate, and real interest rate.

Thank you in advance!