sub convert {
use Math::BigFloat;

my %currency_conv_hash = (IEP=>"EUR",GBP=>"GBP",USD=>"USD",EUR=>"EUR",
FFR=>"EUR", NLG=>"EUR", ESP=>"EUR", DEM=>"EUR", ITL=>"EUR", ATS=>"EUR", BEF=>"EUR", PTE=>"EUR" );

my %rate_hash = (IEP=>".787564",GBP=>"1",USD=>"1",EUR=>"1", FFR=>"6.55957",NLG=>"2.20371", ESP=>"166.386", DEM=>"1.95583", ITL=>"1936.27", ATS=>"13.7603", BEF=>"16.11", PTE=>"200.482" );
    
my($source_currency, $unconverted_amount, $unconverted_total_amount) = @_;
    my $rate=$rate_hash{$source_currency};
    my $line_amount    =  Math::BigFloat->new($unconverted_amount/$rate);
    my $total_amount  =  Math::BigFloat->new($unconverted_total_amount/$rate);

 return ($currency_conv_hash{$source_currency}, (sprintf "%.0f",$line_amount->fround(0)), (sprintf "%.0f",$total_amount->fround(0))
); 

}
Now when I later total all the line amounts i.e. what is returned by sprintf "%.0f",$line_amount>fround(0)), the total is out by a penny or so when compared to (sprintf "%.0f",$total_amount->fround(0))