\input epsf
\nopagenumbers
\magnification=\magstep1

\noindent {\bf Problem statement} A rectangular box is to be
constructed with volume one cubic yard.  The material used in the top
and bottom costs $a$ dollars per square yard, in the front and back
$b$ dollars per square yard, and in the sides $c$ dollars per square
yard.  Find the dimensions which will produce the cheapest box.

\vfil\eject\end