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$ K_{t} = K_{0} \cdot (1 + \frac{ p}{100})^{t} $
$ K_{0} = \frac{ K_{t} }{(1 + \frac{ p}{100})^{t} } $
$ p = (^{t} \sqrt{\frac{K_{t} }{K_{0} }}-1)\cdot 100 $
$ t =\frac{\ln(K_{t} ) - \ln(K_{0} )}{\ln(1 + \frac{ p}{100})} $
Algebra-Finanzmathematik-Zinseszinsformel
$K_{t} = K_{0} \cdot (1 + \frac{ p}{100})^{t}$
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$K_{0} = \frac{ K_{t} }{(1 + \frac{ p}{100})^{t} }$
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$p = (^{t} \sqrt{\frac{K_{t} }{K_{0} }}-1)\cdot 100$
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$t =\frac{\ln(K_{t} ) - \ln(K_{0} )}{\ln(1 + \frac{ p}{100})}$
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Beispiel Nr: 02
$\begin{array}{l} \text{Gegeben:}\\\text{Kapital nach t Jahren} \qquad K_{t} \qquad [Euro] \\
\text{Zinssatz} \qquad p \qquad [\%] \\
\text{Anfangskapital} \qquad K_{0} \qquad [Euro] \\
\\ \text{Gesucht:} \\\text{Anzahl der Jahre} \qquad t \qquad \\
\\ t =\frac{\ln(K_{t} ) - \ln(K_{0} )}{\ln(1 + \frac{ p}{100})}\\ \textbf{Gegeben:} \\ K_{t}=3Euro \qquad p=1\% \qquad K_{0}=30Euro \qquad \\ \\ \textbf{Rechnung:} \\t =\frac{\ln(K_{t} ) - \ln(K_{0} )}{\ln(1 + \frac{ p}{100})} \\
K_{t}=3Euro\\
p=1\%\\
K_{0}=30Euro\\
t =\frac{\ln(3Euro ) - \ln(30Euro )}{\ln(1 + \frac{ 1\%}{100})}\\\\t=-231
\\\\ \end{array}$