if ($raw_value =~ /\*/) {    # multiplication
    $total_value = eval($raw_value);
    ($amount, $base_value) = split(/\*/,$raw_value);
  }
  elsif ($raw_value =~ /\//) { # division
    $base_value = eval($raw_value);
    ($total_value, $amount) = split(/\//, $raw_value);
  }