Enumerate graphs with minipage

Question

I'd like to enumerate my graphs the way it is in the picture attached, but i just can't figure out how to get the numbers at the same place for each graph. Can you help me?

Answer 1

like this?

with use of floatrow and subfig packages:

\documentclass{article}
\usepackage{floatrow}
\usepackage{graphicx}
\usepackage[label font=bf,labelformat=simple]{subfig}
\usepackage{caption}
\floatsetup[figure]{style=plain,subcapbesideposition=top}

%\usepackage[margin=30mm]{geometry}
% Verweise werden im PDF zu Hyperlinks
\begin{document}
%---------------------------------------------------------------%
    \begin{figure}
    \renewcommand\thesubfigure{\arabic{subfigure}}
    \centering
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:a}}
\hfil
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:b}}

\medskip
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:c}}
\hfil
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:d}}

\medskip
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:e}}
\hfil
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:f}}

\medskip
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:g}}
\hfil
\sidesubfloat[]{\includegraphics[width=0.4\textwidth]{example-image}\label{fig:h}}
    \end{figure}
\end{document}