so, the car was £20,000 originally, then, what's its current value 4 years later?
[tex]\bf \qquad \textit{Amount for Exponential Decay}\\\\
A=I(1 - r)^t\qquad
\begin{cases}
A=\textit{accumulated amount}\\
I=\textit{initial amount}\to &2000\\
r=rate\to 18\%\to \frac{18}{100}\to &0.18\\
t=\textit{elapsed time}\to &4\\
\end{cases}
\\\\\\
A=2000(1-0.18)^4\implies A=2000(0.82)^4\implies A=904.24352[/tex]
