\documentclass[DIN, pagenumber=false, parskip=half,
               fromalign=right, fromphone=false, fromfax=false, frombank=true,
               yourmail=false,
               yourref=false,
               fromrule=false]{scrlttr2}
 

%\usepackage{ngerman}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{longtable}
\usepackage{eurosym}

\LoadLetterOption{template}

\newcommand{\stdlohn}[0]{11 \euro}

\renewcommand*{\raggedsignature}{\raggedright} 

\setkomavar{fromname}{GNUnet e. V.}
\setkomavar{fromaddress}{Boltzmannstraße 3 \\ 85748 Garching bei München}
\setkomavar{frombank}{IBAN: DE67830654080004822650 \\ BIC: GENODEF1SLR}

\setkomavar{subject}[]{GHM 2016 (August 18-20) Conference Registration Fees}
%\setkomavar{yourmail}[Ihre Angebots-Nr.]{2011012631}
%\setkomavar{yourref}[Ihre Kundennummer]{263}
\setkomavar{date}[Datum]{\today}


%===================================
% footer
\firstfoot{
	\parbox[t]{\textwidth}{\footnotesize 
	
	\begin{tabular}[t]{l@{}}
		 \multicolumn{1}{@{}l@{}}{Association:}\\ 
		 GNUnet e. V. \\
		 Boltzmannstraße 3, 85748 Garching bei München \\ \\
		 E-Mail: ev@gnunet.org \\
	\end{tabular}
	\hfill{}
	\begin{tabular}[t]{l@{}}
	        \multicolumn{1}{@{}l@{}}{\usekomavar*{frombank}:}\\ 
	        \usekomavar{frombank} 
	\end{tabular} 
 }}

\begin{document}

 
%===================================
% receiver
\begin{letter}{
	Alice Muster \\ 
	Musterstr. 12\\
	12345 Musterstadt
}

\opening{\ }
\vspace{-1.5cm}

%===================================
\begin{longtable}{p{5cm}p{1.5cm}p{3.5cm}p{3.5cm}}
	\hline 	
	Subject & Amount & Item Price & Total Price \\
	\hline 
	
	One day of attendance & 3 & 50,00 \euro{} & 150,00 \euro{}\\
	
	\hline\hline 
\end{longtable}


%\begin{longtable}{p{5.5cm}p{2.5cm}p{2.5cm}p{2cm}p{3cm}}
%	\hline Nettobetrag Gesamt & 19\% MwSt. & Versand & Verpackung & Bruttobetrag\\
%	\hline 
%	0,00 \euro{} & 0,00 \euro & 0,00 \euro & 0,00 \euro & 0,00 \euro{}\\
%	\hline 
%	\hline 	
%\end{longtable}


\vspace{3cm}
Florian Dold\\
Secretary GNUnet e. V.


\end{letter}
\end{document}