12 Monate 3% Erhöhung danach 3Monate 0,75 Erhöhung danach 12 Monate 2,25% wie hoch ist der mittelwert
$${\frac{\left({\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{0.75}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{2.25}}\right)}{{\mathtt{27}}}} = {\frac{{\mathtt{29}}}{{\mathtt{12}}}} = {\mathtt{2.416\: \!666\: \!666\: \!666\: \!666\: \!7}}$$
$${\frac{\left({\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{0.75}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}}{\mathtt{\,\times\,}}{\mathtt{2.25}}\right)}{{\mathtt{27}}}} = {\frac{{\mathtt{29}}}{{\mathtt{12}}}} = {\mathtt{2.416\: \!666\: \!666\: \!666\: \!666\: \!7}}$$