The values are coming back from your database that way, so either don't store them with the space to begin with or run the column in question through something like a TRIM(column) function in your select statement.

Having said that, that use of multiple ifs and 5 different variables looks bletcherous. Use a hash instead keyed on $type and it'd be much cleaner.

my %totals;
# ...
  my( $type, $total ) = @{ $row };
  $totals{ $type } += $total;
#...
my $grand_total += $totals{ $_ } for qw( A B C D W );

print "W: $totals{ 'W' }\n";
print "grand total: $grand_total\n";
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