How to add a percentage column to drupal views? I use Views Aggregator Plus to calculate sum of a column.

items &nbsp; &nbsp;data
A &nbsp; &nbsp; &nbsp; &nbsp; 20
B &nbsp; &nbsp; &nbsp; &nbsp; 40
C &nbsp; &nbsp; &nbsp; &nbsp; 10
____________
Total &nbsp; &nbsp; 70
Then I want to add additional column for percentage.

-----------------------------------------
Item &nbsp; &nbsp; &nbsp; &nbsp;Data &nbsp; &nbsp; &nbsp; &nbsp;Percentage&nbsp;
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A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;20&nbsp;
B &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;30
C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;50
-----------------------------------------
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 100
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I know Global:Math expression. But I don&#39;t know how to get the sum, the sum field(Total) is not available. Only [value], [value_1] and [value_2] available for A, B and C respectively.

Is there a way to add a percentage column?
I have seen this question in another page with unclear answer.
Use php_view module to add column to calculate the percentage 

$field_one = 50;
$field_two = 350;

$new_column = ($field_one / 100) * $field_two;