\documentclass{article}
\usepackage{eurosym}
\usepackage{textcomp}
\begin{document}

the sum is \texteuro{}10 or \euro{10} or \EUR{10.00}.
\rm

\section{This is the first section}

\sf This is in a sans serif font \LaTeX.

\subsection{The next big thing}

Will this be in roman?  And what does \LaTeXe\ look like?

\subsection{The next big thing in bibliographies}

Will this be in roman?  And what does \BibTeX\ look like?

\subsection{The next big thing in slides}

Will this be in roman?  And what does \SLiTeX\ look like?

\end{document}
