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  1. or download this
    my $p = &PricePerUnit(..);
$units = int(0.5 + ($units*$p*100) )/100;
  2. or download this
    int(0.5 + ($units*$p*100) ) => 12400 (ok!!)

but now deviding 12400 by 100 I get
    123.99 instead of 124.00 or 124