You're using single quotes when you attempt to set the formula, but they won't allow your $row variable to be interpolated - you're ending up with a literal '$row' in the excel formula, rather than the value of $row. Instead of: 
$worksheet->write_formula($row+2, 12, '=1-(K.($row+2)/J.($row+2))',$al
+ignPerc);

[download]
You probably want: 
$worksheet->write_formula($row+2, 12, '=1-(K'.($row+2).'/J'.($row+2).'
+)',$alignPerc);

[download]
or: 
my $row_two_right = $row + 2;
$worksheet->write_formula($row_two_right, 12, "=1-(K$row_two_right/J$r
+ow_two_right)",$alignPerc);

[download]
Look at the actual formulas in excel and verify that they are being correctly generated.

In reply to Re: Spreadsheet::WriteExcel formulas in multi-row output by duckyd
in thread Spreadsheet::WriteExcel formulas in multi-row output by finhagen

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