How is the 3rd Party FBA Profit and 3rd Party FBA ROI calculated on the historical data section?

How is the 3rd Party FBA Profit and 3rd Party FBA ROI calculated on the historical data section?

To calculate the 3rd Party FBA Profit AZInsight uses the formula 

Sell Price - FBA Fees - Your custom costs - Buy Cost (if any is entered in the calculator screen)

The Sell Price and Buy Cost used for this calculation come from what is entered on the calculator screen.

To calculate the 3rd Party FBA ROI, AZInsight uses the formula 

Profit / Buy Cost (if any is entered in the calculator screen)

Note: If there is no Buy Cost entered on the calculator or it is zero, then AZInsight will not be able to calculate the 3rd Party FBA ROI