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$ B_{t} = B_{0} \cdot (1 - \frac{ p}{100})^{t} $
$ B_{0} = \frac{B_{t} }{(1 - \frac{ p}{100})^{t} } $
$ t =\frac{\ln(B_{t} ) - \ln(B_{0} )}{ \ln(1 - \frac{ p}{100})} $
$ p = (1 - ^{t} \sqrt{\frac{ B_{t} }{B_{0} }})\cdot 100 $
Algebra-Finanzmathematik-Degressive Abschreibung
$B_{t} = B_{0} \cdot (1 - \frac{ p}{100})^{t}$
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$B_{0} = \frac{B_{t} }{(1 - \frac{ p}{100})^{t} }$
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$t =\frac{\ln(B_{t} ) - \ln(B_{0} )}{ \ln(1 - \frac{ p}{100})}$
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$p = (1 - ^{t} \sqrt{\frac{ B_{t} }{B_{0} }})\cdot 100$
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Beispiel Nr: 05
$\begin{array}{l} \text{Gegeben:}\\\text{Abschreibungssatz} \qquad p \qquad [\%] \\
\text{Anschaffungswert} \qquad B_{0} \qquad [Euro] \\
\text{Buchwert} \qquad B_{t} \qquad [Euro] \\
\\ \text{Gesucht:} \\\text{Anzahl der Jahre} \qquad t \qquad \\
\\ t =\frac{\ln(B_{t} ) - \ln(B_{0} )}{ \ln(1 - \frac{ p}{100})}\\ \textbf{Gegeben:} \\ p=1\frac{3}{8}\% \qquad B_{0}=\frac{3}{4}Euro \qquad B_{t}=8Euro \qquad \\ \\ \textbf{Rechnung:} \\t =\frac{\ln(B_{t} ) - \ln(B_{0} )}{ \ln(1 - \frac{ p}{100})} \\
p=1\frac{3}{8}\%\\
B_{0}=\frac{3}{4}Euro\\
B_{t}=8Euro\\
t =\frac{\ln(8Euro) - \ln(\frac{3}{4}Euro )}{ \ln(1 - \frac{ 1\frac{3}{8}\%}{100})}\\\\t=-171
\\\\ \end{array}$