• Tesco average operating margin for 2012-02-29 was 0%, a 0% decline from 2012-08-31.
• Tesco average operating margin for 2012-08-31 was 0%, a 0% decline from 2013-02-28.
• Tesco average operating margin for 2013-02-28 was 0%, a 0% decline from 2013-08-31.

Operating margin can be defined as operating margin measurement of what proportion of a company's revenue is left over after paying for variable costs of production such as wages, raw materials, etc.