• Costco average return on assets for 2011-08-31 was 0, a 0% decline from 2011-11-30.
• Costco average return on assets for 2011-11-30 was 0, a 0% decline from 2012-02-29.
• Costco average return on assets for 2012-02-29 was 0, a 0% decline from 2012-05-31.

Roa - return on assets can be defined as an indicator of how profitable a company is relative to its total assets. Calculated by dividing a company's operating earnings by its total assets.