unding errors, <a href="http://stackoverflow.com/a/3730040">we store this value in cents
instead of a floating point dollar value</a>.</p>
<p>However, if we display dollar values to our users as "100¢" instead of
"$1.00", they may be very confused. We can write a helper to
format these values into the appropriate human-readable form.</p>
<p>Let's create a <code>format-currency</code> helper that takes an integer count of
cents and turns it into formatted dollars.</p>
<p>To use the <code>format-currency</co