Naw, it just then dawned on me what your question actually was... Whether or not the percentage calculation was also applied to the PerTransaction fee... It was my fault I suppose since I've worked in the bankcard industry for so long, and knew this, I just didn't bother to explain it and/or assumed that everyone knew... Sorry about that..
Well, here's how typical credit card transactions work:
The PerTransaction fee gets added AFTER the percentage calculation takes place... The percentage, or INTERCHANGE calculation is (TheTotalPriceofGoodsPurchased * INTERCHANGE RATE) + PerTransactionFee... In PayPal's case, their interchange rate is 2.9%. This is why when you get a credit card processing rate for a merchant account, your fees are displayed such as 2.9% + $0.30. The percentage rate is NEVER applied to the PerTransaction fee... If it operated like this it would start a "loop". You'd add the PerTransaction fee to the price of goods sold, then do the interchance calculation... THEN you'd have to add the PerTransaction fee again, then do the interchange calculation again...infinately.
If PayPal is applying the $0.30 PerTransaction fee to the item amount BEFORE the percentage calculation, they are in violation of interchange laws...yeah, there are laws that govern interchange for bankcard transactions, so I highly doubt they are... If they are, or do, I'll bet they won't for long.
Randy
Zetajazz44