Question

I am having difficulty with these initial investment losses.
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Answer 1

`\bf \qquad \textit{Amount for Exponential Decay} \\\\ A=P(1 - r)^t\qquad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{initial amount}\dotfill &4000\\ r=rate\to 10\%\to (10)/(100)\dotfill &0.10\\ t=\textit{elapsed time}\\ \end{cases} \\\\\\ A=4000(1-0.10)^t\implies A=4000(0.9)^t \\\\[-0.35em] ~\dotfill`

`\bf \qquad \textit{Amount for Exponential Decay} \\\\ A=P(1 - r)^t\qquad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{initial amount}\dotfill &100\\ r=rate\to 8\%\to (8)/(100)\dotfill &0.08\\ t=\textit{elapsed time}\\ \end{cases} \\\\\\ A=100(1-0.08)^t\implies A=100(0.92)^t`