Example Profit Calculation for a Noon Product

Branded T-shirt (30x20x1cm; 150g) listed for 80 AED:
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1) Estimated DirectShip Total before VAT: 21.6 AED Referral Fees + 14 AED Fulfillment Fees + 0.17 AED return admin + 0.16 AED loss associated with unsellable return = 35.93 AED (44.07 AED unit margin)

DirectShip Referral Fees: 21.6 AED Fees
DirectShip Fulfillment Fees: 14 AED Fees
Return Administration Fee: (lesser of 20% of referral fee and 14 AED) = 4% return rate * 4.32 AED = 0.17 AED
Expected Loss from Defective Return = 0.2% Unsellable Returns * 80 AED = 0.16 AED

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2) Estimated FBN Total before VAT: 21.6 AED Referral Fees + 8 AED Outbound + 0.06 AED Storage 2 Month + 0.21 AED Inbound + 0.17 AED return admin + 0.16 AED loss associated with unsellable return + 0.03 AED Inventory Removal = 30.17 AED (49.83 AED unit margin)

FBN Referral Fees: 21.6 AED (27% for Apparel/Footware/all)
FBN Outbound Fees: 8 AED (Standard Envelope)
FBN Storage Fees: 0.06 AED (2 Months Assumed)
FBA Inbound Cost: 0.21 AED (assumed at 1.43 AED/kg)Return Administration Fee: 4% avg return rate * 4.32 AED = 0.17 AED (lesser of 20% of referral fee and 14 AED)
Expected Loss from Defective Return: 0.16 AED (0.2% Unsellable Returns * 80 AED)
Expected Inventory Removal or Storage of Unsellable Item: 0.03 AED ( 0.2% Unsellable Returns * 15.5 AED (appx) inventory removal) As you see from the example above, FBN tends to be a cheaper option as long as a product sells quickly and inbound cost is not surpassing DirectShip delivery charge. Other things to consider when choosing between channels - conversion benefit of "Express" badge, competition for the featured offers,your  inventory placement strategy (at own premise versus locking inventory at marketplace storage) and others.