You have just deposited $12,500 into an account that promises to pay you an annual interest rate of 6.8 percent each year for the next 4 years. You will leave the money invested in the account and 10 years from today, you need to have $31,740 in the account. What annual interest rate must you earn over the last 6 years to accomplish this goal?

9.43%

10.72%

13.26%

10.88%

11.79%