Carmen’s beauty salon has estimated monthly financing requirements for the next six months as follows: january $ 8,400 april $ 8,400 february 2,400 may 9,400 march 3,400 june 4,400 short-term financing will be utilized for the next six months. projected annual interest rates are: january 8 % april 15 % february 9 may 12 march 12 june 12 what long-term interest rate would represent a break-even point between using short-term financing and long-term financing?