Sale Proceeds = Buybox Price - per item fee + FBA fees + variable closing fee + referral feeProfit = Sale Proceeds - Cost - Inbound Shipping - Prep Cost - FBA Storage FeesMargin = Profit / Buybox PriceROI = Profit / CostTotal COGS = Adjusted Cost * Amazon Pack Quantity / Supplier Pack Quantity * Discount * Supplier DiscountSales per Month = Units per Month * Buybox PriceProfit per Month = Units per Month * Profit