Detailed calculation:
Copper surcharge per kg:(13,20 EUR/kg − 1,55 EUR/kg) × 1,01 = 11,77 EUR/kg
Metal surcharge per item:11,77 EUR/kg × 4,00 kg = 47,08 €
Net item price excluding metal surcharge:630,30 €
Total net price:630,30 € + 47,08 € = 677,38 €
VAT:677,38 € × 19,00 % = 128,70 €
Total gross price:677,38 € + 128,70 € = 806,08 €
Intermediate results and final amount are rounded commercially.