Calculate percentage between two entity fields in Drupal using Computed Field Module
First print_r($data) in your Output code text area so you can see what you can work with. Depending on what you have, your Output code is going to look something like this:

$percent = 100 * $data-&gt;field_accounts_payable_bs['0']['raw']['value'] / $data-&gt;field_customer_deposits_bs['0']['raw']['value'];

print(number_format($percent, 1, '.', ','));