• Paychex average gross margin for 2011-08-31 was 0%, a 0% decline from 2011-11-30.
• Paychex average gross margin for 2011-11-30 was 0%, a 0% decline from 2012-02-29.
• Paychex average gross margin for 2012-02-29 was 0%, a 0% decline from 2012-05-31.

Gross margin can be defined as a company's total sales revenue minus its cost of goods sold, divided by the total sales revenue, expressed as a percentage.