Your objective is to have $31,740 in exactly 10 years. Today you invest $12,500 in a Schwab Differential Rate stock fund. For the next 4 years Schwab guarantees that your investment will earn a 6.8 % annual interest rate. To achieve your objective, during the final 6 years the Schwab fund must pay an annual interest rate of:

Multiple Choice 13.26% 9.43% 10.88% 11.79% 10.72%