[Tex/LaTex] Increase row height in align* cases environment

Question

I'm trying to use cases to present some equations with fractions, and finding that the lines are too compressed to be easily read. Is there a way to increase both the spacing between lines and the size of the typeset characters? The MWE is

\documentclass{article}
\usepackage{amsmath}
\begin{document}

\begin{align*}
A = \begin{cases}
\frac{B-.5b}{C-.5c} & \text{sometimes} \\
\frac{D-.3d}{E-.7e} & \text{other times}
\end{cases}
\end{align*}

\end{document}

which produces

Answer 1

mathtools extends amsmath with dcases:

\documentclass{article}
\usepackage{mathtools}
\begin{document}

\[
A = \begin{dcases}
\frac{B-.5b}{C-.5c} & \text{sometimes} \\
\frac{D-.3d}{E-.7e} & \text{other times}
\end{dcases}
\]

\end{document}