[tex]\bf \qquad \textit{Compound Interest Amount}
\\\\
A=P\left(1+\frac{r}{n}\right)^{nt}
\qquad
\begin{cases}
A=\textit{compounded amount}\\
P=\textit{original amount}\to &6E9\\
r=rate\to 1.4\%\to \frac{1.4}{100}\to &0.014\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{per year, so once}
\end{array}\to &1\\
t=years
\end{cases}[/tex]
now, "t" is years, so for 2010, that'd be t = 10, for 2075, t = 75 and for 2120, yes, you guessed it, t = 120
