If P Dollars Are Invested at the End of Each $$n = \frac { \log \left[ \frac { A r } { P } + 1 \right] } { \log ( 1 + r ) }$$

If P dollars are invested at the end of each year in an annuity that earns interest at an annual rate r, the amount in the account will be A dollars after n years, where $$n = \frac { \log \left[ \frac { A r } { P } + 1 \right] } { \log ( 1 + r ) }$$
If $\$ 2,600$ is invested each year in an annuity earning $12 \%$ annual interest, when will the account be worth $\$ 30,000$ ?

A) $\quad 11.5$ years
B) $\quad 2.8$ years
C) $\quad 2.9$ years
D) $\quad 7.7$ years
E) $\quad 17.7$ years