The archived snapshot preserves one complete worked example. The commission line shows $9.00 at a stated rate of 9%, which corresponds to a $100 selling price. The PayPal line shows a domestic fee of $3.98 on the same sale. Subtracting both from $100 yields the displayed profit of $87.02, with the cost input apparently at zero.
The domestic processing figure of $3.98 on $100 is consistent with a percentage-plus-fixed fee structure rather than a single flat percentage, which matches how PayPal's standard online payment pricing has historically been built. The tool modeled international processing as a separate, higher-cost scenario via its toggle.
Two caveats matter for anyone reconstructing this math today. First, marketplace and processor rates change, so the 9% and $3.98 figures describe the moment of the snapshot, not necessarily the present. Second, one search listing described the commission as '9% on sales $120 and above', implying thresholds in the underlying fee policy that a flat-rate example does not capture.