Product net: 17.0213, gross: 20.00
Attribute net: 5.96, gross: 7.0003
Shipping net: 3.38. gross: 3.9715
=> total tax= 2.9877+ 1.043 + 0.5915 = 4.622 (the 4.62 as Zen-Cart calculated)
Shipping gross: 3.9715 * 1.175 (UK VAT) = 4.6665125 (the 4.66 calculated by Paypal)
Not sure about the 3.92.



