I made a few changes to the conditionals around the eval code to possibly keep mistakes from happening when it is used, but I still can't figure out how to convert the eval EXPR into an eval BLOCK. Like converting a map or grep EXPR to a BLOCK, it isn't as easy as putting {} around it instead of () and expecting it to work the same.

  if ($raw_value && $raw_value =~ /\d+\*\d+/) {
    $total_value = eval($raw_value); # performs multiplication
    ($amount, $base_value) = split(/\*/,$raw_value);
  }
  elsif ($raw_value && $raw_value =~ /\d+\/\d+/) {
    $base_value = eval($raw_value); # performs division
    ($total_value, $amount) = split(/\//, $raw_value);
  }
  else {
    $amount = $raw_value;
    $base_value = $assets->{$lookup_asset} ? $assets->{$lookup_asset} 
+: 0;
    $total_value = $amount * $base_value;
  }
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