If we are talking shelf life I would suggest to do an inventory ratio turnover calculation. (Accounting background) Basically you calculate his from the balance sheet provided in the quarterly updates, this is also why financial reports are important and need to be audited to accuracy and completeness. (Worked for an audit firm) I'd explain what this ratio is but I think this link will be a good run down and further research is required if you're interested. http://smallbusiness.chron.com/compute-inventory-turnover-ratio-balance-sheets-21245.html
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