You made an investment of $15,500 into an account that paid you an annual interest rate of 2.7 percent for the first 3 years and 7.1 percent for the next 10 years. What was your annual rate of return over the entire 13 years?

Multiple Choice

a. 4.90 percent

b. 6.07 percent

c. 5.46 percent

d. 4.85 percent

e. 6.74 percent