Question19. 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 $\$ 5,000$ is invested each year in an annuity earning $8 \%$ annual interest, when will the account be worth $\$ 75,000$ ? Round to the nearest tenth.