The Initial Investment in a Savings Account in Which Interest $\$ 813$

Multiple Choice

The initial investment in a savings account in which interest is compounded continuously is $\$ 813$ . If the time required to double the amount is $9 \frac { 1 } { 4 }$ years, what is the annual rate? Round your answer to two decimal places.

A) $7.49 \%$
B) $7.70 \%$
C) $13.34 \%$
D) $6.29 \%$
E) $8.89 \%$