You borrowed $150,000 to purchase a house. You fixed the loan's interest rate for 12 months at a time. Your loan had an initial term of 23 years with monthly payments. You repaid your loan early, at the end of 4 years. The fixed interest rates were as follows: Year 1: 5.75\%; Year 2: 4.75\%; Year 3: 5.49\%; Year 4: 3.29\%. Calculate the effective interest rate (borrowing cost) on this loan. Enter your answer without the percentage [\%] sign, rounded to 4 decimal places (e.g. 10.4567)