Carmen's Beauty Salon has estimated monthly financing requirements for the next six months as follows: January February March $ 8,400 2,400 3,400 April May June $8,400 9,400 4,400 Short-term financing will be utilized for the next six months. Projected annual interest rates are: January February March 8% 9 April May June 15% 12 12 12 What long-term interest rate would represent a break-even point between using short-term financing and long-term financing? (Round your monthly interest rate to 2 decimal places when expressed as a percent. Round your interest payments to the nearest whole cent. Input your answer as a percent rounded to 2 decimal places.) Interest rate %