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  1. or download this
    >perl -le"printf '%.20e', 38.91
3.89099999999999970000e+001

>perl -le"printf '%.20e', 38.91 * 100
3.89099999999999950000e+003
  2. or download this
    >perl -le"$n=38.91*100; $n=sprintf('%f',$n*1024)/1024; print $n%5;
1
  3. or download this
    >perl -le"$n=3891; print $n%5;
1