[racket-dev] Preserving trailing zeros in formatting numbers as strings

I'm generating class notes in HTML via scribble.  I'm trying to include the
number 10.50 (as a price in an test case, so the trailing 0 matters).  I'm
using format to produce the strings that go into the rendered html.  When I
do this (whether with ~a or ~s), the trailing 0 is dropped, producing 10.5
in my output instead of 10.50.

What can I do to preserve trailing zeros?

thanks,
Kathi
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