Ara Company offers its customers credit terms of 5/10, net 60. Calculate the effective annual interest rate if a customer pays 60 days after the invoice date instead of 10 days after that date. (Use a 360-day year, not 365 days.) (Do not round until your final answer. Enter your final answer as a percentage rounded to the nearest whole number. Do not include the % sign. For example: 0.12345 = 12.345%; enter as 12)