Oh no, not that FAQ again.
Anyway, the best way to round to two decimals, is using sprintf:
$units = sprintf "%.2f", $units*$p;
In case you don't like trailing zeroes (maybe you do), as in "124.00", you can get rid of them using
$units =~ s/\.?0+$//;
turning "123.50" into "123.5", and "124.00" into "124".
Only do this when you know your number contains a decimal point.
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