Question 1129931
h, height
x, side length


{{{hx^2=20}}}

{{{h=20/x^2}}}

<pre>
SURFACES    AREAS         PRICES     PARTIAL COSTS (cents)

BASE          x^2           35       35x^2

SIDES       4hx             10       10*4(20/x^2)x

TOP          x^2            23       23x^2
</pre>
Simplifying the sum of costs for the cost function,

{{{58x^2+800/x}}} {{{cents}}}