F Example below is using variable amounts entered in transaction amount, yearly sales, and average profit margin (highlighted). Enter your own numbers and give it a spin:   $   transaction amount (from sale of slow moving parts) $   Cents on the dollar - $ total expense (transaction amount at 50% discount + 5% fee + estimated 3% for shipping) $ net cash Profit! ROI! -> Sign Up Now -> Contact Us -> Inventory Refresh   $ net cash (reinvested in fast moving parts) x $ yearly sales $ gross sales (from reinvested cash)   $ gross sales x % average profit margin* $ gross profit   $ gross profit - $ net loss (listed above) $ net gain (loss)   $ net gain ÷ $ transaction amount (listed above) net ROI     * Calculations based on figures from Mike Nicholes “Professional Inventory Management” (2005)