mike patrik, a recent ME graduate from MIT, expects to take out a loan to purchase an SUV for $30,000 with a down payment of $10,000. The loan she takes out requires her to pay monthly installments of $400 for 4 years. In addition to the monthly installments, she is also required to pay $8,000 (balloon payment) on the last payment in addition to the final $400 monthly payment.
What is the effective annual interest rate?