Detailed calculation:
Copper surcharge per kg:(13,30 EUR/kg − 1,55 EUR/kg) × 1,01 = 11,87 EUR/kg
Metal surcharge per item:11,87 EUR/kg × 4,00 kg = 47,48 €
Net item price excluding metal surcharge:630,30 €
Total net price:630,30 € + 47,48 € = 677,78 €
VAT:677,78 € × 19,00 % = 128,78 €
Total gross price:677,78 € + 128,78 € = 806,56 €
Intermediate results and final amount are rounded commercially.